A complete Year 9-10 lesson plan for teaching compound interest as part of financial mathematics. Students learn the compound interest formula, work through savings, investment and loan scenarios, and build the financial literacy they will use beyond the classroom.
.svg)
Practice sets that move students from substituting into the formula to solving multi-step problems involving savings growth, loan repayments, and comparing investment options across different compounding periods.
.png)
Real-world scenarios bring compound interest to life: savings accounts, term deposits, student loans and home loans. Students compare options, calculate future values, and see why small differences in rate or frequency add up over time.
Enabling and extending prompts on every question, so students who need the formula broken down get extra scaffolding while confident students model the impact of time, rate, and compounding frequency on bigger investments.
Practice sets that move students from substituting into the formula to solving multi-step problems involving savings growth, loan repayments, and comparing investment options across different compounding periods.
Engaging activities that show students how compound interest plays out in real life — long-term savings, credit card balances, mortgages and investment returns — so the maths feels relevant, not abstract.
Enabling and extending prompts on every question, so students who need the formula broken down get extra scaffolding while confident students model the impact of time, rate, and compounding frequency on bigger investments.
- You in approximately four minutes
Understanding Compound Interest
Students build on their understanding of simple interest, then learn how compound interest accumulates on both the principal and previously earned interest. They see how exponential growth shows up in savings, loans and investments, and why time in the market matters more than people often realise.
Calculating Compound Interest
Students are introduced to compound interest by comparing it side-by-side with simple interest. Using worked examples, they identify the principal, rate, compounding period and time, and see what each variable does to the final amount. By the end of the lesson, they can describe in their own words why compound interest grows faster than simple interest.
Applications of Compound Interest
Students apply the compound interest formula to real financial situations: a savings account, a term deposit, a student loan, and a long-term investment. They explore how changing the compounding frequency — annually, quarterly, monthly or daily — affects the final balance, and use that understanding to compare two options and recommend one with a written justification.
.svg)
