Converting and Calculating Units of Mass
Learn how to convert between mg, g, kg, and tonnes, and add and subtract masses accurately. Let’s get started! 🚀
Video Lesson
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Flashcards
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🛎️ What are Metric Units of Mass?
- Mass is measured in milligrams (mg), grams (g), kilograms (kg), and tonnes (t).
- The conversion rates you have to know: 1000 mg = 1 g, 1000 g = 1 kg, and 1000 kg = 1 t.
🛎️ How to Convert Units of Mass?
- Converting to a smaller unit means multiplying; converting to a larger unit means dividing.
- For example, 21 kg = 21000 g (multiply by 1000) and 560 kg = 0.56 t (divide by 1000).
🛎️ How to Calculate with Different Units?
- Before adding or subtracting, convert all values to the same unit.
- Choose one unit (e.g. all grams or all kilograms) and do not mix units.
Practice Questions
Test your understanding
Convert 2500 milligrams to grams.
Correct! 🎉 +10 pointsNot quite right
2500 milligrams is 2.5 grams because 1 gram = 1000 milligrams. So, grams.
How many grams are in 0.5 kilograms?
Correct! 🎉 +10 pointsNot quite right
0.5 kilograms is 500 grams because 1 kilogram = 1000 grams. So, grams.
Which is heavier: 1.2 kilograms or 1200 grams?
Correct! 🎉 +20 pointsNot quite right
1.2 kilograms is equal to 1200 grams because 1 kilogram = 1000 grams. So, grams.
You have 4.75 kilograms of rice. If you use 750 grams, how much rice is left in kilograms?
Correct! 🎉 +20 pointsNot quite right
Start by converting 750 grams to kilograms: kg. Then subtract kg.
If a truck carries 7.2 tonnes of cargo, how many kilograms is this?
Correct! 🎉 +20 pointsNot quite right
1 tonne equals 1000 kilograms. Since , we get 7.2 tonnes = 7200 kg.
Add 2.5 kilograms and 350 grams. What is the total weight in kilograms?
Correct! 🎉 +30 pointsNot quite right
350 grams is 0.35 kilograms. Adding gives a total of 2.85 kilograms.
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