In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred"). In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred"). In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred").

It is often denoted using the percent sign, "%".

ex. 45% (read as "forty-five percent") is equal to 45/100, or 0.45.

Here are some simple interest tips.

When money is borrowed, interest is charged for use of that money for a certain period. When one is paid back, the principal (amount of money that was borrowed) and the interest is paid back. The amount to interest depends on the interest rate, the amount of money borrowed and the length of time that the money is borrowed.

Converting a decimal to a percent.

Do the following steps to convert a decimal to a percent:

For example: Convert 0.83 to a percent.

-Multiply the decimal by 100 (e.g. 0.83 * 100 = 83)

-Add a percent sign after the answer (e.g. 83%)

Converting a fraction to a percent

Do the following steps to convert a fraction to a percent:

Ex. Convert 4/5 to a percent.

-Divide the numerator of the fraction by the denominator (e.g. 4 ÷ 5=0.80)

-Multiply by 100 (Move the decimal point two places to the right) (e.g. 0.80*100 = 80)

-Round the answer to the desired precision.

-Follow the answer with the % sign (e.g. 80%.)