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History, Civics & Social Studies · Grade 8

Saving, Compounding and Inflation

Why does starting early matter, and why can money sitting still lose value? Learners calculate simple interest (I = Prt) and compound growth (A = P(1 + r/n)^nt), estimate doubling time with the rule of 72, compare short and long time horizons, measure inflation's effect on purchasing power, approximate real returns, and learn how deposit insurance protects bank and credit union deposits. All accounts and rates are fictional, and no products are recommended.

  • 4 lessons
  • About 120 minutes
  • Saving and inflation check: 9 questions
  • Ways to answer: fill in the blanks, choose an answer, estimate, match pairs, type a number and sort into groups
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What learners will discover

  • Calculate simple and compound interest and explain why compounding grows faster over time.
  • Use the compound interest formula and the rule of 72 to compare savings over different time horizons.
  • Explain inflation and calculate its effect on prices, purchasing power and real return.
  • Explain how deposit insurance works and why savings goals affect where money is kept.

Lessons

  1. Simple and compound interest 5 steps3 practiceabout 30 min
  2. The formula and time horizon 5 steps3 practiceabout 30 min
  3. The rule of 72 4 steps3 practiceabout 28 min
  4. Inflation, real return and safety 5 steps4 practiceabout 32 min
  5. Saving and inflation check 9 questions at the end

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