https://maths-angel.com/lessons/distributive-law https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/distributive-property/distributive-property-math-angel.webp Distributive Law The distributive law lets you multiply a number across a sum or difference: a(b + c) = ab + ac. Worked examples expand and factorise brackets. https://iframe.mediadelivery.net/embed/307369/39d9ce97-5695-451a-b9c0-40d8c90c2406 2026-01-05T00:00:00Z 181 yes https://maths-angel.com/lessons/perpendicular-and-parallel-lines https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/perpendicular-and-parallel-lines/perpendicular-and-parallel-lines-math-angel.webp Perpendicular and Parallel Lines Perpendicular lines meet at 90°. Parallel lines never meet and have the same gradient. Spot each type in the examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/5bdbc855-bb00-4d3c-8fdb-4b7e6ce730b8 2026-01-13T00:00:00Z 178 yes https://maths-angel.com/lessons/number-line-inequality-symbols https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/number-line-inequality-symbols/number-line-and-comparing-numbers-math-angel.webp Number Line and Comparing Numbers A number line places numbers in order on a straight line. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/a1b292f3-5100-41f9-976f-93443ec5e2a1 2026-02-02T00:00:00Z 190 yes https://maths-angel.com/lessons/tally-marks-bar-chart https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/tally-marks-bar-chart/tally-mark-charts-bar-charts-tables-math-angel.webp Tally Marks, Bar Charts, Tables Tally marks count in fives, bar charts compare amounts and tables keep data tidy. Flashcards to download to revise all three. https://iframe.mediadelivery.net/embed/307369/aeed3d03-91ce-495e-99c1-4aff4bd0b271 2026-01-05T00:00:00Z 189 yes https://maths-angel.com/lessons/ratios https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/ratios/introduction-to-ratios-math-angel.webp Introduction to Ratios A ratio compares quantities, written as a:b. Simplify ratios and share an amount in a given ratio, with worked examples for each. https://iframe.mediadelivery.net/embed/307369/b4a6bcc1-cb78-4f58-b5d1-228c2bab3b56 2026-02-02T00:00:00Z 210 yes https://maths-angel.com/lessons/expressions-with-one-variable https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/expressions-with-one-variable/deriving-and-evaluating-expressions-with-one-variable-math-angel.webp Deriving and Evaluating Expressions with One Variable An expression uses a letter for a number you do not know yet: 3x + 2 is 11 when x = 3. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/e41710c8-f880-4908-86f5-8bc61e71bd8a 2026-02-05T00:00:00Z 184 yes https://maths-angel.com/lessons/measurement-and-types-of-angles https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/measurement-and-types-of-angles/measurement-and-types-of-angles-math-angel.webp Measurement and Types of Angles Acute, right, obtuse, straight and reflex: the five types of angle. Measure any angle with a protractor and have a go yourself. Flashcards to download too. https://iframe.mediadelivery.net/embed/307369/0ffd8c00-2667-48f6-b231-b8a757a2844a 2026-01-07T00:00:00Z 232 no https://maths-angel.com/lessons/place-value-chart-rounding https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/place-value-chart-rounding/place-value-and-rounding-numbers-math-angel.webp Place Value and Rounding Numbers Place value is what each digit is worth: in 3482 the 4 means 400. To round, look at the next digit; 5 or more rounds up. Download the flashcards to revise. https://iframe.mediadelivery.net/embed/307369/f853bbc7-4a61-43e6-924e-9e9016714bd9 2026-02-02T00:00:00Z 154 yes https://maths-angel.com/lessons/absolute-relative-frequency https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/absolute-relative-frequency/absolute-and-relative-frequency-math-angel.webp Absolute Frequency and Relative Frequency Relative frequency is the absolute frequency divided by the total, so 12 out of 40 is 0.3. Flashcards to download to revise both formulas. https://iframe.mediadelivery.net/embed/307369/273fe5a6-d0a3-491a-8122-d7cf63ad2c93 2026-02-02T00:00:00Z 181 yes https://maths-angel.com/lessons/how-to-combine-ratios https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/how-to-combine-ratios/how-to-combine-ratios-math-angel.webp How to Combine Ratios Combine two ratios into one three-part ratio by matching the common term. Worked examples for GCSE and IGCSE, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/9cb3be1f-d746-4cc1-891b-99df0d8442a2 2026-01-29T00:00:00Z 221 yes https://maths-angel.com/lessons/simplifying-expressions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/simplifying-expressions/simplifying-expressions-math-angel.webp Simplifying Expressions Simplify an expression by collecting like terms: 3x + 2y + 4x − y = 7x + y. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/ae72cefb-febf-4047-a71c-3b35f3268796 2025-12-29T00:00:00Z 206 no https://maths-angel.com/lessons/angle-relationships https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/angle-relationships/angle-relationships-in-intersecting-and-parallel-lines-math-angel.webp Angle Relationships in Intersecting and Parallel Lines Angle relationships form when a line crosses two parallel lines: corresponding, alternate and co-interior. Flashcards to download to learn the names. https://iframe.mediadelivery.net/embed/307369/6c40f2cb-1d77-4f94-8bba-8e1cd6dd5dab 2026-01-11T00:00:00Z 207 yes https://maths-angel.com/lessons/natural-numbers-whole-numbers-integers https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/natural-numbers-whole-numbers-integers/natural-numbers-whole-numbers-and-integers-math-angel.webp Natural Numbers, Whole Numbers, and Integers Natural numbers start at 1, whole numbers include 0, and integers add negatives. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/91fcfa86-a5da-4591-a776-a305615416c8 2026-02-05T00:00:00Z 232 yes https://maths-angel.com/lessons/pie-chart https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/pie-chart/pie-chart-math-angel.webp Pie Chart A pie chart shows data as slices of a circle. Each slice is its share of 360°, so a quarter of the data gets 90°. Flashcards to download. https://iframe.mediadelivery.net/embed/307369/460a3b33-6c97-458c-8fb2-b3bff20112af 2026-01-14T00:00:00Z 234 yes https://maths-angel.com/lessons/fractions-and-percentages https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/fractions-and-percentages/fractions-and-percentages-math-angel.webp Fractions and Percentages A percentage is a fraction out of 100: 3/4 = 75/100 = 75%, and 40% = 40/100 = 2/5. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/f43ce941-e6a6-4a23-8c3e-1c8b67a62b46 2026-01-29T00:00:00Z 172 yes https://maths-angel.com/lessons/simplifying-expressions-multiple-variables https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/simplifying-expressions-multiple-variables/simplifying-expressions-with-multiple-variables-math-angel.webp Simplifying Expressions with Multiple Variables Simplify expressions with multiple variables by collecting like terms and using the index laws. Flashcards to download, plus a 4-minute video. https://iframe.mediadelivery.net/embed/307369/5d19cfee-1135-4b49-9f39-07c310aa87de 2026-02-02T00:00:00Z 222 yes https://maths-angel.com/lessons/polygons-quadrilaterals https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/polygons-quadrilaterals/polygons-and-types-of-quadrilaterals-math-angel.webp Polygons and Types of Quadrilaterals Polygons are shapes with straight sides. Quadrilaterals have four: squares, rectangles, parallelograms, rhombuses and trapeziums. Flashcards to download. https://iframe.mediadelivery.net/embed/307369/43783796-7d65-459d-9a71-fa91f0437430 2026-02-02T00:00:00Z 185 yes https://maths-angel.com/lessons/rational-numbers https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/rational-numbers/rational-numbers-and-their-location-on-a-number-line-math-angel.webp Rational Numbers and Their Location on a Number Line A rational number is one integer over another, like 3/4, −2 or 0.75; √2 and π are not. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/1117df41-a2df-449a-9ebd-fa6b2ac25466 2026-02-02T00:00:00Z 183 yes https://maths-angel.com/lessons/line-graphs-curve-graphs https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/line-graphs-curve-graphs/line-graphs-and-curve-graphs-math-angel.webp Line Graphs and Curve Graphs Line graphs connect points with straight lines, curve graphs use smooth curves. Read, draw and compare both kinds. Flashcards to download. https://iframe.mediadelivery.net/embed/307369/51b9e1ea-f4f8-4e07-9903-1a11e4674cab 2026-02-02T00:00:00Z 197 yes https://maths-angel.com/lessons/percentage-of-a-number https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/percentage-of-a-number/how-to-find-percentage-of-a-number-math-angel.webp How to Find Percentage of a Number Find a percentage of a number by multiplying it by the rate, so 20% of 60 is 0.2 × 60 = 12. Flashcards to download to revise the method. https://iframe.mediadelivery.net/embed/307369/d4cae3be-15b6-4a04-8e2c-16c51c15572f 2026-02-02T00:00:00Z 238 no https://maths-angel.com/lessons/expanding-double-brackets https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/expanding-double-brackets/expanding-double-brackets-math-angel.webp Expanding Double Brackets Expand double brackets term by term: (x + 2)(x + 3) = x² + 3x + 2x + 6 = x² + 5x + 6. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/90ce0990-6191-4be6-ab81-178058b6d410 2026-01-30T00:00:00Z 225 yes https://maths-angel.com/lessons/properties-of-circles https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/properties-of-circles/properties-of-circles-math-angel.webp Properties of Circles All points on a circle are equidistant from the centre. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/f19c81a3-bfd0-4064-bde5-82de23f60659 2026-01-14T00:00:00Z 158 yes https://maths-angel.com/lessons/absolute-value https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/absolute-value/absolute-value-math-angel.webp Absolute Value Absolute value is the distance from zero, so |−5| = 5 and |5| = 5; it is never negative. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/76b6b039-9fef-4474-8da6-f365d255063f 2026-01-16T00:00:00Z 217 yes https://maths-angel.com/lessons/mean-median-mode-range https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/mean-median-mode-range/how-to-calculate-the-mean-median-mode-and-range-math-angel.webp How to Calculate the Mean, Median, Mode and Range The range is the biggest value minus the smallest. Mean, median and mode are the three averages. Download the flashcards to revise. https://iframe.mediadelivery.net/embed/307369/15285efe-193f-4e39-b491-578a30fbaeed 2026-02-02T00:00:00Z 209 yes https://maths-angel.com/lessons/interest-rate-calculation https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/interest-rate-calculation/interest-and-interest-rate-calculation-math-angel.webp Interest and Interest Rate Calculation Interest = principal × rate × time, so £200 at 5% for a year earns £10. Flashcards to download to revise the formula. https://iframe.mediadelivery.net/embed/307369/b61c25a3-6403-4691-b205-5bd4a3bc7ea7 2026-02-02T00:00:00Z 216 yes https://maths-angel.com/lessons/square-of-a-binomial https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/square-of-a-binomial/square-of-a-binomial-math-angel.webp Square of a Binomial (a + b)² = a² + 2ab + b². The middle term, 2ab, is the one people forget. Worked examples, plus a 4-minute video. https://iframe.mediadelivery.net/embed/307369/ca25927e-0dd0-40e9-b4b4-9e1d7007a5ce 2026-01-30T00:00:00Z 258 yes https://maths-angel.com/lessons/thales-theorem https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/thales-theorem/thales-theorem-math-angel.webp Thales' Theorem Thales' Theorem states that any triangle drawn on a semicircle's diameter has a 90° angle. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/de61f386-06a9-464c-bb2c-6cfbdae1e88b 2026-01-30T00:00:00Z 178 yes https://maths-angel.com/lessons/basic-arithmetic-inverse-operations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/basic-arithmetic-inverse-operations/basic-arithmetic-and-inverse-operations-math-angel.webp Basic Arithmetic and Inverse Operations Basic arithmetic covers addition, subtraction, multiplication and division; inverse operations undo each other. Worked examples, plus flashcards. https://iframe.mediadelivery.net/embed/307369/55b41765-9dcd-4673-846b-8695be3c23da 2026-02-02T00:00:00Z 182 yes https://maths-angel.com/lessons/median-mean-mode-frequency-table https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/median-mean-mode-frequency-table/median-mean-mode-range-from-a-frequency-table-math-angel.webp Median, Mean, Mode and Range from a Frequency Table Mean from a frequency table: multiply each value by its frequency, add up, divide by the total. Flashcards to download, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/d09d9844-f34f-4620-8b46-f382f38af852 2026-02-02T00:00:00Z 215 yes https://maths-angel.com/lessons/simple-interest-and-compound-interest https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/simple-interest-and-compound-interest/simple-interest-and-compound-interest-math-angel.webp Simple Interest and Compound Interest Simple interest earns a fixed amount each year; compound interest earns on the interest too. Flashcards to download for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/60995668-69a2-4c2e-aa0e-63bcba5d8a2a 2026-01-29T00:00:00Z 223 yes https://maths-angel.com/lessons/introduction-to-mapping https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/introduction-to-mapping/introduction-to-mapping-math-angel.webp Introduction to Mapping Mapping in maths shows the relationship between two quantities, like time and speed. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/1a5072b4-16ad-453c-ae11-438ba4667686 2026-01-29T00:00:00Z 171 yes https://maths-angel.com/lessons/units-of-area https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/units-of-area/units-of-area-math-angel.webp Units of Area Area measures how much space a surface covers, in units like mm², cm², and m². Flashcards to download, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/2518e60a-3849-4eb8-9534-6e38289e3a51 2026-01-29T00:00:00Z 189 yes https://maths-angel.com/lessons/bidmas-order-of-operations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/bidmas-order-of-operations/bidmas-order-of-operations-math-angel.webp BIDMAS - Order of Operations BIDMAS is the order of operations: Brackets, Indices, Divide, Multiply, Add, Subtract. Flashcards to download, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/8c5f07bc-6713-4651-829d-246f0cf9f3ea 2025-12-31T00:00:00Z 172 yes https://maths-angel.com/lessons/box-plot https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/box-plot/how-to-draw-and-read-a-box-plot-math-angel.webp How to Draw and Read a Box Plot A box plot shows data distribution using minimum, Q1, median, Q3, and maximum. GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/14f43cfe-1a72-40f6-b238-ecd98e5c0d2d 2026-02-02T00:00:00Z 198 yes https://maths-angel.com/lessons/percentage-increase-and-decrease https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/percentage-increase-and-decrease/percentage-increase-and-decrease-math-angel.webp Percentage Increase and Decrease Percentage increase and decrease use one formula: original × (1 ± change). Reverse percentages are covered too. Download the flashcards to revise. https://iframe.mediadelivery.net/embed/307369/2cdb26ae-fcd7-4174-9a3e-efd0674c50e8 2026-01-11T00:00:00Z 203 yes https://maths-angel.com/lessons/introduction-to-formulas https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/introduction-to-formulas/introduction-to-formulas-math-angel.webp Introduction to Formulas A formula links quantities with letters: A = l × w, so a 5 by 3 rectangle has area 15. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/d9f2a681-e3ac-4317-9d47-b9ec6776fd8e 2026-01-16T00:00:00Z 160 yes https://maths-angel.com/lessons/area-of-a-triangle https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/area-of-a-triangle/area-of-a-triangle-math-angel.webp Area of a Triangle Find the area of any triangle with ½ × base × height. The height must be at right angles to the base. Download the flashcards to see the worked examples. https://iframe.mediadelivery.net/embed/307369/29db6614-e589-4ee4-a320-e556058633b0 2026-01-07T00:00:00Z 202 yes https://maths-angel.com/lessons/commutative-and-associative-laws https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/commutative-property-associative-property/commutative-property-and-associative-property-math-angel.webp Commutative and Associative Laws Commutative: a + b = b + a. Associative: (a + b) + c = a + (b + c). Same for multiplying. Flashcards to download to revise both laws. https://iframe.mediadelivery.net/embed/307369/929e1da1-9f50-44c9-b521-d63bdb92fd16 2026-02-02T00:00:00Z 196 yes https://maths-angel.com/lessons/grouped-frequency-table https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/grouped-frequency-table/averages-from-grouped-frequency-table-math-angel.webp Averages from a Grouped Frequency Table A grouped frequency table puts data into class intervals. Find the modal class, median class and estimated mean. Flashcards for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/8cb01554-2d29-492f-a63d-0dbc7b4e9fbb 2026-02-02T00:00:00Z 194 yes https://maths-angel.com/lessons/percentage-change https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/percentage-change/how-to-calculate-percentage-change-math-angel.webp How to Calculate Percentage Change Percentage change = (new − original) ÷ original × 100, so £40 rising to £50 is a 25% increase. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/15004970-5e31-4c4a-bc6b-88ef208e233f 2026-02-02T00:00:00Z 239 yes https://maths-angel.com/lessons/introduction-to-functions-and-graphs https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/introduction-to-functions-and-graphs/introduction-to-functions-and-graphs-math-angel.webp Introduction to Functions and Graphs A function maps each input to exactly one output, like f(x) = 2x + 1. GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/ed2bbdab-c4e0-4fe1-86ac-2fae1f38b576 2026-01-30T00:00:00Z 219 yes https://maths-angel.com/lessons/perimeter-of-a-polygon https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/perimeter-of-a-polygon/perimeter-of-a-polygon-math-angel.webp Perimeter of a Polygon The perimeter of a polygon is the total length of all its sides. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/f90a4c8a-0b21-42b0-ac54-2ef83df50a3e 2026-01-29T00:00:00Z 181 yes https://maths-angel.com/lessons/column-addition-and-subtraction https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/column-addition-and-subtraction/column-addition-and-column-subtraction-math-angel.webp Column Addition and Column Subtraction Column addition and subtraction are used to add and subtract multi-digit numbers vertically. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/62c5b636-e1d5-49f6-b27c-7d76415a92c8 2026-02-02T00:00:00Z 190 yes https://maths-angel.com/lessons/calculating-probability https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/calculating-probability/calculating-probability-math-angel.webp Calculating Probability Probability = favourable outcomes ÷ total outcomes. Rolling a 6 on a dice is 1/6; an even number is 3/6 = 1/2. Worked examples, plus flashcards. https://iframe.mediadelivery.net/embed/307369/a98d125d-a053-48ea-96d9-5e4377e15bd1 2026-01-29T00:00:00Z 186 yes https://maths-angel.com/lessons/directly-proportional-inversely-proportional https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/directly-proportional-inversely-proportional/directly-proportional-and-inversely-proportional-math-angel.webp Directly Proportional and Inversely Proportional Direct: y = kx, both grow together. Inverse: xy = k, one grows as the other shrinks. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/2fe68cf9-ac04-4091-b0a9-9ae0ef3affe3 2026-02-02T00:00:00Z 205 yes https://maths-angel.com/lessons/solving-equations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/solving-equations/solving-equations-math-angel.webp Solving Equations Solving equations means finding the value that makes the equation true, like x = 3 in 3x + 2 = 11. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/9f2fd2c8-873c-4420-aaa6-db74ecd4e285 2026-01-29T00:00:00Z 212 yes https://maths-angel.com/lessons/area-of-a-trapezium https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/area-of-a-trapezium/area-of-a-trapezium-math-angel.webp Area of a Trapezium Find the area of a trapezium with ½ × (a + b) × h. Add the parallel sides, halve, then multiply by the height. Worked examples show each step. https://iframe.mediadelivery.net/embed/307369/76c64b36-6fd9-40e9-94d0-8b0352d85f00 2026-01-07T00:00:00Z 244 yes https://maths-angel.com/lessons/long-multiplication https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/long-multiplication/long-multiplication-math-angel.webp Long Multiplication Long multiplication splits large calculations into smaller digit-by-digit steps. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/203b2bc2-7324-47f7-9ecc-e2c93543291d 2026-01-22T00:00:00Z 198 yes https://maths-angel.com/lessons/addition-rule-of-probability-expected-frequency https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/addition-rule-of-probability-expected-frequency/addition-rule-of-probability-and-expected-frequency-math-angel.webp Addition Rule of Probability and Expected Frequency For mutually exclusive events, P(A or B) = P(A) + P(B). GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/b5253743-e1ad-4f8d-9a51-c2651b686548 2026-02-02T00:00:00Z 215 yes https://maths-angel.com/lessons/direct-proportion https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/direct-proportion/direct-proportion-formula-and-examples-math-angel.webp Direct Proportion Formula and Examples Direct proportion means both values increase together using y = kx. GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/9203a199-2087-4f56-aadf-d065037485ed 2026-02-05T00:00:00Z 213 yes https://maths-angel.com/lessons/solving-rational-equations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/solving-rational-equations/solving-rational-equations-math-angel.webp Solving Rational Equations Rational equations have x in a denominator, like 6/x = 2. Multiply both sides by x to clear the fraction, then solve: x = 3. Worked examples included. https://iframe.mediadelivery.net/embed/307369/7242050c-49b0-45c7-929f-87273cc7dd3f 2026-01-29T00:00:00Z 237 yes https://maths-angel.com/lessons/area-parallelograms-triangles https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/area-parallelograms-triangles/area-of-parallelograms-and-triangles-math-angel.webp Area of Parallelograms and Triangles Area of a parallelogram = base × height, and a triangle is half of that: ½ × base × height. Worked examples, plus a 3-minute video. https://iframe.mediadelivery.net/embed/307369/9845ee6c-2c13-4d8c-91de-b9830f3b21fc 2026-02-02T00:00:00Z 180 yes https://maths-angel.com/lessons/long-division https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/long-division/long-division-math-angel.webp Long Division Long division goes one digit at a time: divide, multiply, subtract, bring down, repeat. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/666a493d-8659-4536-b3ee-c199351462d0 2026-01-06T00:00:00Z 190 yes https://maths-angel.com/lessons/probability-tree-diagrams https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/probability-tree-diagrams/probability-tree-diagrams-math-angel.webp Probability Tree Diagrams Probability tree diagrams show all outcomes step by step. Free 4-minute video, plus interactive practice and flashcards for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/ed34fd8d-a6af-4131-bf6b-29e5d7c27722 2026-01-29T00:00:00Z 231 no https://maths-angel.com/lessons/inverse-proportion https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/inverse-proportion/inverse-proportion-formula-and-examples-math-angel.webp Inverse Proportion Formula and Examples Inverse proportion means one value increases as the other decreases, keeping xy = k constant. GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/e96ceb03-7d42-4d98-bb59-fbe86528d3a5 2026-02-05T00:00:00Z 212 yes https://maths-angel.com/lessons/m-and-c-in-linear-equations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/m-and-c-in-linear-equations/gradient-and-y-intercept-in-linear-equations-math-angel.webp Gradient and Y-Intercept in Linear Equations In y = mx + c, m is the gradient and c is the y-intercept. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/aaca209c-89ef-48bd-a30f-f6ac909fcf59 2026-02-02T00:00:00Z 221 yes https://maths-angel.com/lessons/area-of-compound-shapes https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/area-of-compound-shapes/area-of-compound-shapes-math-angel.webp Area of Compound Shapes Split a compound shape into rectangles and triangles, find each area, then add them up. Worked examples, plus a 3-minute video. https://iframe.mediadelivery.net/embed/307369/d8d1a755-8fef-4e1d-855f-8bb8f215f6e6 2026-02-02T00:00:00Z 181 yes https://maths-angel.com/lessons/decimal-point-movement https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/decimal-point-movement/movement-of-the-decimal-point-math-angel.webp Movement of the Decimal Point Moving the decimal point right multiplies a number by 10, 100 or 1000; moving it left divides. A 3-minute video, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/7e1ec062-fca5-4bd8-a6b4-ffcf85f014de 2026-02-02T00:00:00Z 188 yes https://maths-angel.com/lessons/sets-and-venn-diagrams https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/probability-statistics/sets-and-venn-diagrams/sets-and-venn-diagrams-math-angel.webp Sets and Venn Diagrams A Venn diagram shows how sets overlap: the middle is in both, the outside in neither. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/b2fe37bf-7ad2-426e-a173-089733e3144f 2026-01-30T00:00:00Z 237 yes https://maths-angel.com/lessons/speed-distance-time https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/speed-distance-time/speed-distance-time-maths-angel.webp Speed, Distance and Time Speed = distance ÷ time, so 120 miles in 2 hours is 60 mph. Cover the one you want on the formula triangle to find it. Worked examples included. https://iframe.mediadelivery.net/embed/307369/4572d180-991d-40a0-bc94-03d6dcdddfaf 2026-05-29T00:00:00Z 249 yes https://maths-angel.com/lessons/equation-of-a-straight-line https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/equation-of-a-straight-line/finding-the-equation-of-a-straight-line-math-angel.webp Finding the Equation of a Straight Line A straight line is y = mx + c, where m is the gradient and c is where it crosses the y-axis. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/a8eea4eb-c622-4296-b69f-24694f5ecb4c 2026-02-02T00:00:00Z 204 yes https://maths-angel.com/lessons/circumference-area-circle-sector https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/circumference-area-circle-sector/circumference-and-area-of-a-circle-and-a-sector-math-angel.webp Circumference and Area of a Circle and a Sector The circumference of a circle is C = 2πr and the area is A = πr². GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/c89bfcaa-94aa-423c-914f-81412d6dd0e3 2026-02-03T00:00:00Z 191 yes https://maths-angel.com/lessons/adding-and-subtracting-negative-numbers https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/adding-and-subtracting-negative-numbers/adding-and-subtracting-negative-numbers-math-angel.webp Adding and Subtracting Negative Numbers Adding and subtracting negatives: two signs the same make a plus, two different make a minus. Flashcards to download to revise the rules. https://iframe.mediadelivery.net/embed/307369/c89b2b97-d369-4d5d-9fd7-194245d221b1 2026-01-29T00:00:00Z 220 yes https://maths-angel.com/lessons/density-mass-volume https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/density-mass-volume/density-mass-volume-maths-angel.webp Density, Mass and Volume Density = mass ÷ volume, in g/cm³ or kg/m³. Cover the one you want on the formula triangle to find it. Download the flashcards for GCSE and IGCSE revision. https://iframe.mediadelivery.net/embed/307369/fbd59103-04b0-45e8-9e4c-39dc85743b03 2026-05-29T00:00:00Z 247 no https://maths-angel.com/lessons/x-intercept-y-intercept-intersection https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/x-intercept-y-intercept-intersection/how-to-find-x-intercept-y-intercept-and-intersections-math-angel.webp How to Find X-Intercept, Y-Intercept and Intersections x-intercept: set y = 0. y-intercept: set x = 0. Two lines cross where their equations match. GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/870b939d-3813-4c53-8f24-7c51b4e03095 2026-02-02T00:00:00Z 186 yes https://maths-angel.com/lessons/line-of-symmetry https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/line-of-symmetry/line-of-symmetry-and-reflection-symmetry-math-angel.webp Line of Symmetry and Reflection Symmetry A line of symmetry splits a shape into two mirror-image halves. A square has 4, a rectangle 2, a regular pentagon 5. Download the flashcards to revise. https://iframe.mediadelivery.net/embed/307369/396aee08-175f-42f4-a28a-798011ae379a 2025-12-27T00:00:00Z 230 no https://maths-angel.com/lessons/multiplying-and-dividing-negative-numbers https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/multiplying-and-dividing-negative-numbers/multiplying-and-dividing-negative-numbers-math-angel.webp Multiplying and Dividing Negative Numbers Multiplying or dividing negatives: same signs give a plus, different signs give a minus. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/f4221a21-5079-4231-9125-8099373ac337 2026-01-29T00:00:00Z 184 yes https://maths-angel.com/lessons/pressure-force-area https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/ratio-proportion-rates-of-change/pressure-force-area/pressure-force-area-maths-angel.webp Pressure, Force and Area Pressure = force ÷ area, in N/m² (pascals), so 50 N on 2 m² is 25 N/m². Cover the one you want on the triangle to find it. Flashcards to download. https://iframe.mediadelivery.net/embed/307369/cfee5513-1e8f-46d1-bedb-31959d2f91b0 2026-05-29T00:00:00Z 240 yes https://maths-angel.com/lessons/nth-term-of-a-linear-sequence https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/nth-term-of-a-linear-sequence/nth-term-of-a-linear-sequence-maths-angel.webp Finding the nth Term of a Linear Sequence In 2, 5, 8, 11 the terms go up by 3 each time, so the nth term is 3n − 1. Flashcards to download, plus a 4-minute video. https://iframe.mediadelivery.net/embed/307369/598247d6-638d-40a8-a844-442033d9bf7a 2026-05-29T00:00:00Z 258 yes https://maths-angel.com/lessons/rotational-symmetry https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/rotational-symmetry/rotational-symmetry-math-angel.webp Rotational Symmetry A shape has rotational symmetry if it looks the same after turning less than 360°. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/22ef1ce5-409a-4726-b44d-3879b6b7346f 2026-01-05T00:00:00Z 217 no https://maths-angel.com/lessons/calculating-money https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/calculating-money/calculating-money-math-angel.webp Calculating Money Calculating money involves separating pounds and pence for each operation. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/8b5bd8ed-9903-4002-8392-0627ecc13e8d 2026-01-22T00:00:00Z 203 yes https://maths-angel.com/lessons/quadratic-and-geometric-sequences https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/quadratic-and-geometric-sequences/quadratic-and-geometric-sequences-maths-angel.webp Quadratic Sequence and Geometric Sequence Quadratic sequences have a constant second difference. GCSE quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/b209800f-baa5-4b1a-87d3-038402ba4ba6 2026-05-29T00:00:00Z 244 yes https://maths-angel.com/lessons/reflecting-points-coordinate-plane https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/reflecting-points-coordinate-plane/plotting-and-reflecting-points-on-the-coordinate-plane-math-angel.webp Plotting and Reflecting Points on the Coordinate Plane Reflecting in the x-axis changes (x, y) to (x, −y); in the y-axis to (−x, y). Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/70ada385-2a37-4960-b692-f4bac978a730 2026-02-02T00:00:00Z 214 yes https://maths-angel.com/lessons/units-of-length https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/units-of-length/converting-and-calculating-units-of-length-math-angel.webp Converting and Calculating Units of Length 1 km = 1000 m, 1 m = 100 cm and 1 cm = 10 mm. Convert between them and add or subtract lengths. Free 4-minute video, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/fe3ca9fa-7832-4cbf-9871-12451432be98 2026-01-05T00:00:00Z 227 no https://maths-angel.com/lessons/fibonacci-sequence https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/fibonacci-sequence/fibonacci-sequence-maths-angel.webp Fibonacci Sequence and Fibonacci-Type Sequences A Fibonacci sequence adds the two previous terms to get the next, like 1, 1, 2, 3, 5. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/2fa5ad6b-4c7f-4c46-aefe-535ee1616ba2 2026-05-29T00:00:00Z 251 yes https://maths-angel.com/lessons/translating-shapes https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/translating-shapes/translating-shapes-math-angel.webp Translating Shapes Translation slides a shape on a grid without changing size or orientation. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/863841c0-ae7f-4c88-9eb7-c494377f3809 2026-01-29T00:00:00Z 204 yes https://maths-angel.com/lessons/units-of-mass https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/units-of-mass/converting-and-calculating-units-of-mass-math-angel.webp Converting and Calculating Units of Mass 1 tonne = 1000 kg, 1 kg = 1000 g and 1 g = 1000 mg: multiply going down, divide going up. Flashcards to download, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/87be0dcc-0f3f-47fc-b4b1-3e7f2071e48a 2026-02-02T00:00:00Z 213 yes https://maths-angel.com/lessons/simple-quadratic-equations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/simple-quadratic-equations/simple-quadratic-equations-math-angel.webp Simple Quadratic Equations The coefficient a in y = ax² controls whether a parabola opens up or down and how wide it is. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/6098e1ca-c0dc-4ed7-9a25-285ba9ee9c41 2026-02-03T00:00:00Z 221 yes https://maths-angel.com/lessons/rotating-shapes https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/rotating-shapes/rotating-shapes-math-angel.webp Rotating Shapes Rotation turns a shape around a fixed point called the centre of rotation. Worked examples for GCSE and IGCSE, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/95a299be-46a1-4072-b1db-6d131be2a5df 2026-01-29T00:00:00Z 212 yes https://maths-angel.com/lessons/converting-time https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/converting-time/converting-time-and-calculating-time-math-angel.webp Converting Time and Calculating Time 1 hour = 60 minutes and 1 minute = 60 seconds, so 2 h 15 min is 135 minutes. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/2eb734a2-12de-4b9b-88dd-3e372f9353d9 2026-02-02T00:00:00Z 180 yes https://maths-angel.com/lessons/vertex-form https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/vertex-form/vertex-form-and-parabola-transformations-math-angel.webp Vertex Form and Parabola Transformations Vertex form is y = a(x - h)² + k, where (h, k) is the vertex of the parabola. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/8b30874a-0a18-4fcb-9261-5fc14323b825 2026-02-03T00:00:00Z 224 yes https://maths-angel.com/lessons/enlargement https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/enlargement/introduction-to-enlargement-math-angel.webp Introduction to Enlargement Enlargement changes a shape's size using a scale factor from a fixed centre. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/1875731e-48ee-4c0b-a3a8-99cf759aedfa 2026-02-05T00:00:00Z 206 yes https://maths-angel.com/lessons/divisibility-rules https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/divisibility-rules/divisibility-and-divisibility-rules-math-angel.webp Divisibility and Divisibility Rules Divisibility rules for 2 to 10 are simple digit checks to test if a number divides evenly. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/d43a90e5-9b98-46b9-a915-3352e75bbfa0 2026-02-02T00:00:00Z 202 yes https://maths-angel.com/lessons/converting-standard-form-and-vertex-form https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/converting-standard-form-and-vertex-form/converting-quadratics-standard-form-and-vertex-form-math-angel.webp Converting Quadratics: Standard Form and Vertex Form Convert quadratic equations between standard form and vertex form. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/7714e250-58f0-47bc-95ce-ab1b87d845c7 2026-01-11T00:00:00Z 213 yes https://maths-angel.com/lessons/constructing-triangles https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/constructing-triangles/constructing-triangles-math-angel.webp Constructing Triangles Construct a triangle from three sides, two sides and an angle, or two angles and a side, with ruler, compasses and protractor. Flashcards to download. https://iframe.mediadelivery.net/embed/307369/73551670-2ca3-4652-be9b-5c8b85b4bee0 2026-01-29T00:00:00Z 244 yes https://maths-angel.com/lessons/prime-numbers-prime-factorisation https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/prime-numbers-prime-factorisation/prime-numbers-and-prime-factorisation-math-angel.webp Prime Numbers and Prime Factorisation A prime number has exactly two factors: 1 and itself. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/11428535-88b7-47fe-b666-8fb7a282da9e 2026-03-26T00:00:00Z 203 yes https://maths-angel.com/lessons/quadratic-equations-in-vertex-form-standard-form https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/quadratic-equations-in-vertex-form-standard-form/how-to-write-quadratic-equations-in-vertex-form-and-standard-form-math-angel.webp How to Write Quadratic Equations in Vertex Form and Standard Form Vertex form y = a(x − h)² + k needs the vertex and one point; standard form needs three points. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/d57d6ece-1121-4462-9c6b-38261a5cca92 2026-02-03T00:00:00Z 225 yes https://maths-angel.com/lessons/congruent-triangles https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/congruent-triangles/congruent-triangles-math-angel.webp Congruent Triangles Congruent means identical in shape and size. Four tests prove it: SSS, SAS, ASA and RHS (right angle, hypotenuse, side). Interactive practice to try. https://iframe.mediadelivery.net/embed/307369/b7bc6a3f-039a-4193-8ea6-c135493395da 2026-01-11T00:00:00Z 226 yes https://maths-angel.com/lessons/hcf-and-lcm https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/hcf-and-lcm/how-to-find-hcf-and-lcm-math-angel.webp How to Find HCF and LCM The HCF is the largest factor two numbers share; the LCM is their smallest common multiple. A 4-minute video, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/69b48b2d-6252-4bf4-b423-54eff30adf6f 2026-02-02T00:00:00Z 241 yes https://maths-angel.com/lessons/solving-simple-quadratic-equations https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/solving-simple-quadratic-equations/solving-simple-quadratic-equations-math-angel.webp Solving Simple Quadratic Equations Solve x² = 25 by taking the square root (x = ±5) and x² − 4x = 0 by factorising: x(x − 4) = 0. Worked examples for GCSE and IGCSE, plus flashcards. https://iframe.mediadelivery.net/embed/307369/798f74b8-0815-4ed7-95c5-a36d42cfe331 2026-02-03T00:00:00Z 229 yes https://maths-angel.com/lessons/perpendicular-bisectors-and-circumcircle https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/perpendicular-bisectors-and-circumcircle/perpendicular-bisectors-and-circumcircle-math-angel.webp Perpendicular Bisectors and Circumcircle A perpendicular bisector divides a line segment in half at 90°. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/229da1db-7275-4850-b944-c999c933618b 2026-02-03T00:00:00Z 197 yes https://maths-angel.com/lessons/introduction-to-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/introduction-to-fractions/introduction-to-fractions-math-angel.webp Introduction to Fractions Fractions show parts of a whole with a numerator and denominator, like 3/4. Find a fraction of an amount too. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/42bc68fd-d5ad-4a29-a0da-b452470e4025 2026-01-29T00:00:00Z 214 yes https://maths-angel.com/lessons/solving-quadratic-equations-factorising https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/solving-quadratic-equations-factorising/solving-quadratic-equations-by-factorising-math-angel.webp Solving Quadratic Equations by Factorising x² + 5x + 6 = 0 factorises to (x + 2)(x + 3) = 0, so x = −2 or x = −3. Worked examples for GCSE and IGCSE, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/aa72ccce-ce0c-493b-9d09-35c8ed4ce9b9 2026-01-11T00:00:00Z 226 yes https://maths-angel.com/lessons/angle-bisectors-and-incircle https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/angle-bisectors-and-incircle/angle-bisectors-and-incircle-math-angel.webp Angle Bisectors and Incircle An angle bisector cuts an angle in half. A triangle's three bisectors meet at the centre of its incircle. Flashcards to download to revise. https://iframe.mediadelivery.net/embed/307369/4001c546-aa02-46d0-806f-73718341c4b0 2026-01-30T00:00:00Z 185 yes https://maths-angel.com/lessons/equivalent-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/equivalent-fractions/equivalent-fractions-math-angel.webp Equivalent Fractions Equivalent fractions look different but have the same value, like 1/2 = 2/4 = 3/6. A 3-minute video, plus a quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/1af47d16-c0a9-4e79-af86-b23dff312436 2026-01-29T00:00:00Z 202 yes https://maths-angel.com/lessons/quadratic-formula https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/quadratic-formula/solving-quadratic-equations-quadratic-formula-math-angel.webp Solving Quadratic Equations: Quadratic Formula The quadratic formula solves equations in the form ax² + bx + c = 0. Interactive practice to try, plus flashcards for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/73d8c27f-b441-4e4b-a0ee-9d92391cdf2a 2026-02-03T00:00:00Z 204 yes https://maths-angel.com/lessons/medians-and-centroid-of-a-triangle https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/medians-and-centroid-of-a-triangle/medians-and-centroid-of-a-triangle-math-angel.webp Medians and Centroid of a Triangle A median joins a vertex to the midpoint of the opposite side; the three meet at the centroid. Flashcards to download to revise the properties. https://iframe.mediadelivery.net/embed/307369/4666c5cd-c27d-4280-90d6-b575f3fb0720 2026-01-30T00:00:00Z 191 yes https://maths-angel.com/lessons/comparing-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/comparing-fractions/comparing-fractions-math-angel.webp Comparing Fractions To compare fractions, use the same denominator: 2/3 = 8/12 and 3/4 = 9/12, so 3/4 is bigger. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/a538b8a6-0936-44f5-bb63-7f4f0c1d0983 2026-01-29T00:00:00Z 182 yes https://maths-angel.com/lessons/equations-with-2-variables https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/equations-with-2-variables/solving-equations-with-two-variables-math-angel.webp Solving Equations with 2 Variables x + 2y = 20 has many solutions: x = 2 gives y = 9, x = 4 gives y = 8. Plotted, they make a straight line. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/c17880e8-7df1-4857-84cc-432b8c91d73a 2026-02-20T00:00:00Z 183 yes https://maths-angel.com/lessons/solids-units-of-volume https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/solids-units-of-volume/solids-and-units-of-volume-math-angel.webp Solids and Units of Volume 1 cm³ = 1 ml and 1000 cm³ = 1 litre, so a 10 by 10 by 10 cm box holds a litre. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/cdae0955-0c22-435b-929b-46d23595fe69 2026-02-02T00:00:00Z 207 yes https://maths-angel.com/lessons/adding-and-subtracting-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/adding-and-subtracting-fractions/adding-and-subtracting-fractions-math-angel.webp Adding and Subtracting Fractions Adding and subtracting fractions requires a common denominator when fractions are unlike. Worked examples, plus a 3-minute video. https://iframe.mediadelivery.net/embed/307369/707b36fc-a9df-4af7-8e0d-d8e58f3631ef 2026-01-29T00:00:00Z 207 yes https://maths-angel.com/lessons/solving-simultaneous-equations-graphically https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/solving-simultaneous-equations-graphically/solving-simultaneous-equations-graphically-math-angel.webp Solving Simultaneous Equations Graphically Simultaneous equations can be solved by plotting both lines and reading off where they cross. Flashcards to download to revise the method. https://iframe.mediadelivery.net/embed/307369/d0e38af9-ff57-4afe-b86b-dac654cfbc4d 2026-02-02T00:00:00Z 199 yes https://maths-angel.com/lessons/volume-of-a-cuboid https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/volume-of-a-cuboid/volume-of-a-cuboid-and-cube-math-angel.webp Volume of a Cuboid and Cube Find the volume of a cuboid with length × width × height, and a cube with side³. Download the flashcards to revise. https://iframe.mediadelivery.net/embed/307369/c70711e2-64f6-4c19-89e9-188ea8ce7f3d 2026-02-02T00:00:00Z 184 no https://maths-angel.com/lessons/multiplying-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/multiplying-fractions/multiplying-fractions-math-angel.webp Multiplying Fractions Multiply the tops, multiply the bottoms, then simplify, or cross-cancel first. Whole and mixed numbers are covered. Download the flashcards to revise. https://iframe.mediadelivery.net/embed/307369/2d796bec-7094-44ca-b3b6-f4ba9d5808eb 2026-01-07T00:00:00Z 175 yes https://maths-angel.com/lessons/equal-values-and-substitution-method https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/equal-values-and-substitution-method/simultaneous-equations-equal-values-and-substitution-method-math-angel.webp Simultaneous Equations: Equal Values and Substitution Method Solve simultaneous equations with the equal values method or the substitution method. A 4-minute video, plus a GCSE quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/27de15ac-5672-43ac-88f9-1ddd0ee790ae 2026-02-02T00:00:00Z 217 yes https://maths-angel.com/lessons/surface-area https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/surface-area/surface-area-of-solids-math-angel.webp Surface Area of Solids Surface area is the total area of all faces of a 3D shape. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/3b1b18a3-7732-4218-bc50-5dd35d85e1b3 2026-02-02T00:00:00Z 214 yes https://maths-angel.com/lessons/dividing-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/dividing-fractions/dividing-fractions-math-angel.webp Dividing Fractions Dividing fractions means keeping the first fraction, flipping the second, and multiplying. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/6b95b332-f08b-4b3e-bbcd-607781487ec1 2026-01-29T00:00:00Z 159 yes https://maths-angel.com/lessons/elimination-method https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/algebra/elimination-method/elimination-method-for-solving-simultaneous-equations-math-angel.webp Elimination Method for Solving Simultaneous Equations Elimination adds or subtracts two simultaneous equations to remove one letter, then solves. Flashcards for GCSE and IGCSE, plus a 4-minute video. https://iframe.mediadelivery.net/embed/307369/6313f7aa-d695-491a-8f67-3b1b80b364a9 2026-02-02T00:00:00Z 227 yes https://maths-angel.com/lessons/volume-prisms-cylinders https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/volume-prisms-cylinders/volume-of-prisms-and-cylinders-math-angel.webp Volume of Prisms and Cylinders Volume of a prism = cross-section area × length; for a cylinder that is πr²h. Flashcards to download to revise both formulas. https://iframe.mediadelivery.net/embed/307369/ae69fc3a-e9e6-4164-8cb0-bfaeaa275988 2026-01-11T00:00:00Z 182 yes https://maths-angel.com/lessons/decimals-and-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/decimals-and-fractions/decimals-and-fractions-math-angel.webp Decimals and Fractions Decimals and fractions are two ways to show parts of a number. Quiz to test yourself, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/ee103d31-2433-4112-ba29-31c99dc7534d 2026-01-29T00:00:00Z 184 yes https://maths-angel.com/lessons/cavalieris-principle https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/cavalieris-principle/principle-of-cavalieri-math-angel.webp Cavalieri's Principle Cavalieri's principle: solids with equal heights and equal cross-sections have equal volumes. Worked examples compare the volumes of different solids. https://iframe.mediadelivery.net/embed/307369/42ff52e9-1fea-4f70-95ba-dbb1f7c5646f 2026-02-03T00:00:00Z 135 yes https://maths-angel.com/lessons/comparing-and-rounding-decimals https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/comparing-and-rounding-decimals/comparing-and-rounding-decimals-math-angel.webp Comparing and Rounding Decimals Compare decimals digit by digit from the left; to round, 5 or more in the next digit rounds up. Worked examples, plus a 3-minute video. https://iframe.mediadelivery.net/embed/307369/67db90c8-dea4-445d-939b-9116064325ca 2026-01-29T00:00:00Z 151 yes https://maths-angel.com/lessons/volume-surface-area-pyramids-cones-spheres https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/volume-surface-area-pyramids-cones-spheres/volume-and-surface-area-of-pyramids-cones-spheres-math-angel.webp Volume and Surface Area of Pyramids, Cones, Spheres Pyramids and cones share the formula V = ⅓ × base area × height. Flashcards to download, plus a GCSE quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/850c37c1-890a-49d5-9f07-4abab8841289 2026-02-03T00:00:00Z 226 yes https://maths-angel.com/lessons/convert-fraction-to-decimal https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/convert-fraction-to-decimal/convert-fraction-to-decimal-using-long-division-math-angel.webp Convert Fraction to Decimal Using Long Division A fraction converts to a decimal by dividing the numerator by the denominator. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/3e8d9744-741a-4087-81ad-56a78b0bf0ed 2026-02-02T00:00:00Z 175 yes https://maths-angel.com/lessons/pythagoras-theorem https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/pythagoras-theorem/pythagoras-theorem-math-angel.webp Pythagoras' Theorem Find a missing side of a right-angled triangle with a² + b² = c², in 2D or 3D. Worked examples show each step for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/047e94c1-64d4-428e-b2dc-5b2b6dac966c 2026-01-11T00:00:00Z 197 yes https://maths-angel.com/lessons/adding-subtracting-fractions-and-decimals https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/adding-subtracting-fractions-and-decimals/adding-and-subtracting-fractions-and-decimals-math-angel.webp Adding and Subtracting Fractions and Decimals To add or subtract fractions and decimals, convert them to one form first. Worked examples of both methods, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/e6358083-1481-4518-bb0f-1a2dcf3096af 2026-02-02T00:00:00Z 175 yes https://maths-angel.com/lessons/trigonometry-sine-cosine-tangent https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/trigonometry-sine-cosine-tangent/trigonometry-sine-cosine-tangent-math-angel.webp Trigonometry: Sine, Cosine, Tangent Trigonometry ratios (sin, cos, tan) find missing sides and angles in right-angled triangles. Free 3-minute video, plus a GCSE quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/aa42e38c-43dd-43a9-b13e-4f850ff15153 2026-01-11T00:00:00Z 202 no https://maths-angel.com/lessons/multiplying-decimals https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/multiplying-decimals/multiplying-decimals-math-angel.webp Multiplying Decimals To multiply decimals, ignore the points, multiply as whole numbers, then put the point back. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/e5218cf5-0d7d-47eb-97e1-67ad6ef90ee0 2026-01-29T00:00:00Z 193 yes https://maths-angel.com/lessons/cosine-rule https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/cosine-rule/cosine-rule-math-angel.webp Cosine Rule The cosine rule finds missing sides and angles in triangles without a right angle. A 3-minute video, plus a GCSE quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/4bc45a5d-094e-474f-b0b0-6daabaf5cc67 2026-02-05T00:00:00Z 164 yes https://maths-angel.com/lessons/calculating-fractions-and-decimals https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/calculating-fractions-and-decimals/calculating-fractions-and-decimals-math-angel.webp Calculating Fractions and Decimals The commutative, associative and distributive laws make fraction and decimal sums quicker. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/283b261a-5af8-419d-a37e-6ff519465eac 2026-01-29T00:00:00Z 222 yes https://maths-angel.com/lessons/sine-rule https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/geometry-measures/sine-rule/sine-rule-math-angel.webp Sine Rule The sine rule, a/sin A = b/sin B = c/sin C, finds a side from a side and two angles. Flashcards to download, plus a GCSE quiz to test yourself. https://iframe.mediadelivery.net/embed/307369/dcbd7682-72fe-47de-8aeb-005da207723c 2026-01-30T00:00:00Z 155 yes https://maths-angel.com/lessons/recurring-decimals-to-fractions https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/recurring-decimals-to-fractions/convert-recurring-decimals-to-fractions-math-angel.webp Convert Recurring Decimals to Fractions Recurring decimal to fraction: let x = 0.333…, so 10x = 3.333…, then 9x = 3 and x = 1/3. Worked examples for GCSE and IGCSE, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/e5216b7b-9dc9-41c8-a82e-00efbf0af755 2026-02-02T00:00:00Z 156 yes https://maths-angel.com/lessons/powers-indices https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/powers-indices/powers-and-indices-math-angel.webp Powers and Indices Powers and indices mean repeated multiplication, for example, 5³ = 5 × 5 × 5. Interactive practice to try, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/b5a3609e-ce58-49be-b8d3-655b51e2ac21 2026-02-02T00:00:00Z 200 yes https://maths-angel.com/lessons/standard-form https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/standard-form/standard-form-math-angel.webp Standard Form Standard form writes a big or small number as A × 10ⁿ, with A between 1 and 10. So 26000 = 2.6 × 10⁴. Download the flashcards for GCSE and IGCSE revision. https://iframe.mediadelivery.net/embed/307369/429390b1-16b6-4a25-adf1-4ed51d340f4b 2026-01-08T00:00:00Z 188 yes https://maths-angel.com/lessons/basics-of-square-roots https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/basics-of-square-roots/basics-of-square-roots-math-angel.webp Basics of Square Roots A square root is a non-negative value that, when squared, gives the original number, so √49 = 7. Worked examples, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/e12790c2-c137-46e7-998b-724ae3080fcd 2026-01-30T00:00:00Z 170 yes https://maths-angel.com/lessons/multiplying-dividing-square-roots https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/multiplying-dividing-square-roots/multiplying-and-dividing-square-roots-math-angel.webp Multiplying and Dividing Square Roots Multiplying square roots follows √a × √b = √(ab), and dividing follows √a ÷ √b = √(a/b). Flashcards to download for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/c50b75e2-6393-4370-9ddf-9d494c329bb0 2026-02-03T00:00:00Z 217 yes https://maths-angel.com/lessons/laws-of-indices-same-base-or-index https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/laws-of-indices-same-base-or-index/laws-of-indices-(same-base-or-same-indices)-math-angel.webp Laws of Indices (Same Base, Same Indices) Laws of indices: with the same base, add the exponents to multiply and subtract to divide. Worked examples for GCSE and IGCSE, plus flashcards to download. https://iframe.mediadelivery.net/embed/307369/eb504843-e694-43c5-bf0a-2de05b3366e1 2026-02-03T00:00:00Z 231 yes https://maths-angel.com/lessons/negative-indices-and-power-of-a-power https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/negative-exponents-power-of-a-power/negative-exponents-and-power-of-a-power-math-angel.webp Negative Indices and Power of a Power Negative indices flip the base to a reciprocal, and power of a power multiplies the exponents. Worked examples for GCSE and IGCSE, plus a 4-minute video. https://iframe.mediadelivery.net/embed/307369/2bbe5493-8f8b-45db-899f-432f798a7e77 2026-02-03T00:00:00Z 213 yes https://maths-angel.com/lessons/nth-root-fractional-indices https://mathangelwebsitestorage.blob.core.windows.net/mathangel-lesson-images/numbers/nth-root-fractional-indices/the-nth-root-and-fractional-indices-math-angel.webp The nth Root and Fractional Indices A fractional index is a root: x^(1/2) = √x and x^(1/3) = ∛x, so 8^(1/3) = 2 and 8^(2/3) = 4. Flashcards to download for GCSE and IGCSE. https://iframe.mediadelivery.net/embed/307369/57674059-93dc-451f-a06d-0d86db0367e7 2026-02-03T00:00:00Z 231 yes