Instructional Activity# Examples 4–5: Finding the Original Amount Given a Percent Increase or Decrease

Lesson 4. Unit 4. Grade 7 EngageNY

EngageNY9 min(s)

This Instructional Activity is a part of the Lesson 4, Unit 4, Grade 7. Note that upcoming lessons focus on finding the whole given a percent change, as students often are challenged by these problem types. The population of cats in a rural neighborhood has declined in the past year by roughly 30%. Residents hypothesize that this is due to wild coyotes preying on the cats. The current cat population in the neighborhood is estimated to be 12. Approximately how many cats were there originally?