Students learn how to calculate a repeated percentage change using decimal multipliers. As learning progresses students consider the overall percentage change to lead in to compound interest in subsequent lessons.
The start of the lesson recaps finding the equivalent decimal multiplier after a simple percentage increase or decrease. At the end of the lesson students are challenged to set up and solve an equation to find the rate of interest when the final amount is known.
Differentiated Learning Objectives
- All students should be able to calculate a decimal multiplier given a percentage change.
- Most students should be able to calculate an equivalent successive percentage change.
- Some students should be able to calculate the percentage change needed by the end of the second year.