Review of Introductory Mathematics
PERCENTAGES
Example:
Change 2.7 to percent.
2.7 x 100 = 270%
Changing Common Fractions and Whole Numbers to Percent
When changing common fractions to percent, convert the fraction to a decimal, then multiply by
100 and add the percent symbol.
Example:
Change
to a percent
3
5
0.6 x 100 = 60%
When changing a whole number to a percent, multiply by 100 and add the percent symbol.
Example:
Change 10 to percent
10 x 100 = 1000%
Percents are usually 100% or less. Percents are most often used to describe a fraction, but can
be used to show values greater than 1(100%). Examples are 110%, 200%, etc.
Changing a Percent to a Decimal
Any number written as a percent may be written as a decimal. To change a percent to a decimal,
drop the percent symbol and divide by 100.
Example:
Express 33.5% in decimal form.
= 0.335
33.5
100
Express 3.35% in decimal form.
= 0.0335
3.35
100
Rev. 0
Page 57
MA-01
