Unit Rates and Percents

Front

What is a unit rate?

Back

A unit rate is a comparison of two different quantities where one of the quantities is expressed as a quantity of one. For example, if you travel 60 miles in 2 hours, the unit rate is 30 miles per hour.

Front

How do you calculate a percent of a number?

Back

To calculate a percent of a number, convert the percent to a decimal and multiply it by the number. For example, to find 20% of 150, convert 20% to 0.20 and multiply: 0.20 x 150 = 30.

Front

What is 20% of 150?

Back

30

Front

How do you find the price per unit?

Back

To find the price per unit, divide the total price by the number of units. For example, if you pay $15.00 for 6 gallons of gasoline, the price per gallon is $15.00 ÷ 6 = $2.50.

Front

What is the price per gallon if I paid $15.00 for 6 gallons?

Back

$2.50

Front

How do you calculate the number of items lost based on a percentage?

Back

To calculate the number of items lost based on a percentage, multiply the total number of items by the percentage (as a decimal). For example, if a soccer team played 120 games and lost 20%, they lost 120 x 0.20 = 24 games.

Front

If a soccer team played 120 games and lost 20%, how many games did they lose?

Back

24 games

Front

How do you find what number a percentage is of?

Back

To find what number a percentage is of, divide the part by the percentage (as a decimal). For example, if 16 is 25% of a number, divide 16 by 0.25 to find the number: 16 ÷ 0.25 = 64.

Front

16 is 25% of what number?

Back

64

Front

How do you compare prices to find the better buy?

Back

To compare prices, calculate the price per unit for each option. The option with the lower price per unit is the better buy.