Calculating Percents

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 and express how much of something there is in relation to a whole.

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 30% of 20, calculate 20 x 0.30 = 6.

Front

What is 30% of $20?

Back

$6

Front

How do you find the total amount if you know the percent and the part?

Back

To find the total amount, divide the part by the percent (as a decimal). For example, if $6 is 30%, the total is 6 ÷ 0.30 = $20.

Front

What is the formula for calculating the percent increase?

Back

Percent Increase = ((New Value - Original Value) / Original Value) x 100.

Front

What is the formula for calculating the percent decrease?

Back

Percent Decrease = ((Original Value - New Value) / Original Value) x 100.

Front

If a bill is $6.68 and you want to leave a 23% tip, how do you calculate the tip?

Back

Multiply the bill amount by the tip percentage (as a decimal): $6.68 x 0.23 = $1.54.

Front

What is 12% of 40?

Back

4.8

Front

How do you convert a fraction to a percent?

Back

To convert a fraction to a percent, divide the top number (numerator) by the bottom number (denominator) and multiply by 100. For example, 1/4 = (1 ÷ 4) x 100 = 25%.

Front

A team wins 17 out of 25 games. How do you calculate the winning percentage?

Back

Winning Percentage = (Number of Wins / Total Games) x 100. So, (17 / 25) x 100 = 68%.