LET’S TRY ONE
An initial amount of 100 grows by 20% each period. What is the amount after 2 periods?
144
Multiply by 6/5 each period: 100 × ()2 = 144.
Learning steps & teaching tips
Evaluate repeated growth using a constant multiplicative factor.
- Turn a percent increase into one plus the rate, then apply that factor each period.
- Work through the example and explain why each operation is used.
- Estimate or use another method to check the result before choosing.
Try it together
Work with a partner: solve one example, explain the method, then change one number and predict what changes.
Turn a percent increase into one plus the rate, then apply that factor each period.