Percent Decrease Problems

Percent Decrease

Formative Assessment

Summary of the Math: Percent Decrease

Read and Discuss

  • A percent can describe a change in a value that decreases. Such a percent is called a percent decrease.
  • If an amount decreases by x%, you can multiply that amount by (100% − x%) to determine the final amount.
  • For example, if the percent decrease is 5% and the original amount is m, then 100 − 5 = 95% = 0.95
    0.95m = the final amount


Can you:

  • Explain how to calculate a percent decrease?
  • Give examples of situations that involve percent decrease?
  • Describe how to use a table to organize the information in a percent decrease problem?