Percent of a Number

Front

What is a percent?

Back

A percent is a way of expressing 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 20% of 50, calculate 50 x 0.20 = 10.

Front

What is 40% of 55?

Back

22

Front

If 30% of 130 exhibits contain birds, how many exhibits contain birds?

Back

39

Front

What is 70% of 40?

Back

28

Front

What is 20% of 80?

Back

16

Front

If 75% of students are taller than 60 inches, how many are shorter than 60 inches in a class of 20?

Back

5

Front

What does it mean if a number is 70% of another number?

Back

It means that the first number is 70 out of every 100 parts of the second number.

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 number if you know the percent and the part?

Back

The formula is: Whole = Part / (Percent as a decimal). For example, if 28 is 70% of a number, the whole number is 28 / 0.70 = 40.