Percent Increase and DecreaseChange over original — and why the original is always the…7th GradePercent change is the size of the changedivided by the ORIGINAL amount, times 100.change ÷ original × 100£40 → £5230% increaseChange is 12; 12/40 = 0.3.£60 → £4525% decreaseChange is 15; 15/60 = 0.25.Increase 80 by 15%9280 × 1.15.Decrease 80 by 15%6880 × 0.85.THE COMMON MISTAKE£40 → £52 is 12/52it is 12/40You compare the change to where it started, not where it ended.A 20% rise then a 20% fall does not return you to the start — thesecond 20% is of a bigger number.Percent Increase and Decreaselittleactivity.com

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Math · 7th Grade

Percent Increase and Decrease

Change over original — and why the original is always the bottom.

How to use it

Ask what the change is being compared to. That number goes on the bottom.

Free · print-ready PDF · US Letter and A4

Grade
7th Grade
Ages
12–13
Subject
Math
Pages
1

The rest of the 7th Grade wall

49 more posters, all free to print.

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