Percents and Finding the Whole

Front

What is a percent?

Back

A percent is a way to express a number as a fraction of 100. It is often used to compare ratios or to describe proportions.

Front

How do you calculate a percent of a number?

Back

To calculate a percent of a number, multiply the number by the percent (as a decimal). For example, to find 25% of 80, calculate 80 x 0.25 = 20.

Front

What does it mean to find the whole when given a percent?

Back

Finding the whole means determining the original number when a percent of it is known. For example, if 60% of a number is 90, the whole number can be found by dividing 90 by 0.60.

Front

What is 25% of 80?

Back

20

Front

If 60% of a number is 90, what is the number?

Back

150

Front

If 20% of a number is 30, what is the number?

Back

150

Front

What is 10% of 500?

Back

50

Front

If 15% of a number is 45, what is the number?

Back

300

Front

How do you convert a percent to a decimal?

Back

To convert a percent to a decimal, divide the percent by 100. For example, 25% becomes 0.25.

Front

What is the formula to find the whole from a percent?

Back

The formula is: Whole = Part / (Percent as a decimal). For example, if 15% of a number is 45, the whole is 45 / 0.15.