This lesson is an optional review of percent change. A repeated percent increase or decrease is introduced as an exponential change.

The lesson also reviews using the distributive property to rewrite a sum or difference as a product in order to simplify repeated calculation. Looking for equivalent ways to express percentage change is largely about strategically using the distributive property (MP7).

This lesson could be bypassed if the Check Your Readiness assessment and performance on earlier lessons in this unit on rewriting expressions using the distributive property indicate that students don't need to review these concepts and skills.