A Quick Conversion Guide for Fractions, Decimals, and Percents

Part of the Basic Math & Pre-Algebra For Dummies Cheat Sheet

Fractions, decimals, and percents are the three most common ways to give a mathematical description of parts of a whole object. Fractions are common in baking and carpentry when you're using English measurement units (such as cups, gallons, feet, and inches). Decimals are used with dollars and cents, the metric system, and in scientific notation. Percents are used in business when figuring profit and interest rates, as well as in statistics.

Use the following table as a handy guide when you need to make basic conversions among the three.

Fraction Decimal Percent
1/100 0.01 1%
1/20 0.05 5%
1/10 0.1 10%
1/5 0.2 20%
1/4 0.25 25%
3/10 0.3 30%
2/5 0.4 40%
1/2 0.5 50%
3/5 0.6 60%
7/10 0.7 70%
3/4 0.75 75%
4/5 0.8 80%
9/10 0.9 90%
1 1.0 100%
2 2.0 200%
10 10.0 1,000%
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