What Students Learn

Learning objectives

• The difference between simple interest and compound interest — and why compound interest produces faster growth
• How “interest on interest” causes savings to grow exponentially rather than at a flat rate
• How to apply the compound interest formula to calculate the future value of a savings or investment
• Why starting to save early makes a significant difference — and how time is the most powerful variable in compounding
• How compound interest works in reverse — intensifying credit card debt and loan balances when payments fall short
• The importance of compounding frequency (daily, monthly, annually) when comparing financial products

For Teachers

How to use this lesson

Use this lesson as the follow-on to simple interest — students should already know how to calculate I = P × R × T before taking this step. Open with the video, then work through a side-by-side example: the same $1,000 over 20 years at 5%, using simple vs. compound interest. The gap at year 20 tends to be a memorable reveal.

Discussion: Where does compound interest work for you? (Savings accounts, investments, retirement accounts.) Where does it work against you? (Credit card balances, payday loans, student loans.) This dual framing helps students understand that the same math applies — it just depends on which side of the equation they are on.

Best positioned after simple interest and before credit card interest lessons. Strong connector between banking and credit units — compound interest is the mechanism that makes both savings and credit card debt behave the way they do.

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