Percent Increase and Decrease with Equations. Percent decrease 100 - new old 100 where new is the newer quantity or measure and old is the older quantity or measure. Decrease by percentage Exceljet.
In the example the active cell contains this formula.
Divide that amount by the absolute value of the starting value. Illustrative Math Unit 73 Lesson 8 printable worksheets Lesson 8 Summary. The following diagram shows how to solve percent increase and decrease problems by writing an equation to represent the situation and solving it. Multiply by 100 to get percent decrease.