Book 1 · Everyday Math

Percent Calculator

Three moves in one: a percent of a number, one number as a percent of another, and percent up or down between two figures.

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Pick a mode, enter the numbers, and press Calculate.
From the book — Chapter 1. A percent is just a fraction with 100 on the bottom. 15% of 80 is 0.15 × 80 = 12. To find what one number is of another, divide and multiply by 100. For a change, take the difference over the original — an increase from 120 to 150 is 30 ÷ 120 = 25% up.

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