10 ft to 7 ft. Describe the percent of change as an increase or decrease.

percent change = (new number - old number) / (old number) * 100

percent change = (7 - 10) / (10) * 100

percent change = - 3/10 * 100

percent change = - 30%

A negative percent change is a decrease.

A positive percent change is an increase.

This change is a - 30% change, or it can be described as a 30% decrease.