Lesson Plan: Compound Interest Mathematics • 9th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to solve problems involving compound interest.


Students will be able to

  • recall the formula for calculating compound interest and understand what each of the individual variables represents,
  • calculate the amount of interest earned or the total value of an investment after a given time period, where
    • interest is compounded annually,
    • interest is compounded at an interval other than 1 year.
  • solve associated compound interest problems, such as calculating the minimum time interval at which interest must be compounded in order to reach a certain value.


Students should already be familiar with

  • simple interest,
  • exponential growth.


Students will not cover

  • logarithms,
  • depreciation,
  • interest compounded continuously.

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