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Percents

A percent employs a percent sign (%) followed by a number. It looks like
this: 23%. A percent represents a fraction in
which the number to the left of the % sign is the numerator and 100 is the
denominator. "Percent" means "parts per hundred," or "out of 100." 23% is
equivalent to 23 hundredths, or 23/100, or 0.23.

100% is equal to 100 out of 100, or 1. Percents greater than 100% are fractions
(or decimals) greater than 1, while percents less than 100% are fractions (or
decimals) less than 1.

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Expressing Percents as Decimals

To convert a percent into a decimal, move the decimal point 2 places to the left
and drop the percent sign. 36% becomes 0.36, and 145% becomes 1.45. If the
number in front of the percent has fewer than two places in front of the
decimal, add zeros to the left of the number, and then move the decimal place.
For example, 5% = 05% = 0.05 and 1.78% = 01.78% = 0.0178.

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Expressing Decimals as Percents

To convert a decimal into a percent, move the decimal point two places to the
right and add the % sign. If there are fewer than two places to the right of
the decimal, add zeros at the end of the number after the decimal point. For
example, 0.986 = 98.6% and 1.8 = 1.80 = 180%.

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Expressing Percents as Fractions

As stated earlier, a percent is a fraction in which the number preceding the
% sign is the numerator and 100 is the denominator. Therefore, the first step
in writing a percent as a fraction in lowest terms is writing it as a fraction
with denominator 100. For example, we write 82% as 82/100 and 50% as 50/100.

The next step is to reduce the
fraction--see Fractions.
82/100 reduces to 41/50 and 50/100 reduces to 1/2. Thus, 82% = 41/50 and 50% = 1/2.