Simple Interest and Compound Interest

Learn the difference between simple and compound interest and how each grows money over time. Let’s get started! 🚀

Simple Interest and Compound Interest - introduction visual

Video Lesson

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Flashcards

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Simple interest calculation example, showing the principal amount, interest rate, and time in years, resulting in £15 interest over 3 years.Compound interest calculation over three years showing the formula and total amount of £115.8 from an initial £100.Comparison of simple interest and compound interest formulas, showing calculations for total amount and interest earned over years.

🛎️ How to Calculate Simple Interest?

  • Interest is calculated using the formula Interest = Principal × rate × time (number of year).
  • The principal does not change, so the interest is the same each year.
  • The total amount is calculated using Total = Principal + Interest.

🛎️ How to Calculate Compound Interest?

  • The total amount is calculated using Total = Principal × (1 + rate)ᵗ.
  • Interest is added to the principal each year, so the amount keeps increasing.
  • The interest is calculated using Interest = Total − Principal.

🛎️ Simple and Compound Compared

  • Simple interest increases by the same amount each year.
  • Compound interest increases faster over time because interest is added to the total.
  • Compound interest is commonly used by banks.

Practice Questions

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Interactive Activity

Compare how different interest methods affect growth over time

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