Chapter 3 · Decimals and percents · page 16 of 68
Percent means per hundred
levelPre-algebra
standard6.RP.A.3c
practiceDecimals and percents
A percent is a fraction with 100 on the bottom. 35% is 35 out of 100, which is 0.35, which is 7/20. Fractions, decimals and percents are three ways to write the same number.
How to use it
- Percent to decimal: divide by 100, so the point moves two places left.
- Decimal to percent: multiply by 100, so the point moves two places right.
- Fraction to percent: divide top by bottom, then multiply by 100. Or scale the fraction so the bottom is 100.
Example
Where it goes wrong
- Moving the point one place instead of two: 35% is not 3.5.
- Writing 1/8 as 12.5 instead of 12.5%. The percent sign is part of the number.