Decimals to % and % to Decimals

I teach my students to count by 2 to turn a decimal to a percentage.

Converting decimals to percentages:

To convert a decimal into a percentage, we move the decimal point 2 digits to the right of the number and add a % sign.

Examples:

.12 =12% 

.132=13.2%

.25=25%

0.014=1.4%

4.29=429%

Converting percentages to decimal:

To convert a percentage into a decimal, we move the decimal point 2 digits to the left of the number and remove the % sign.

Examples:

30%=.30
41.7%=.417

125%=1.25

.34%=.0034

Now try for yourself:

Convert 21%, 2.3%, 60.1% 234% into decimals
Convert .34, .75, 1.39, .045 into percentages

Answers: .21, .023, .601, 2.34, 34%, 75%, 139%, and 4.5%