Unit Rates

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 drive 60 miles in 2 hours, the unit rate is 30 miles per hour.

Front

How do you calculate a unit rate?

Back

To calculate a unit rate, divide the first quantity by the second quantity. For example, if you have 90 miles driven and 15 gallons of gas, the unit rate is 90 miles ÷ 15 gallons = 6 miles per gallon.

Front

If Joshua drove 90 miles on 15 gallons of gas, what is the unit rate?

Back

6 miles per gallon (mpg).

Front

You spend $40 on 5 pounds of concrete. What is the unit rate in dollars per pound?

Back

$8 per pound.

Front

What is the unit rate if my father drove 231 miles with 7 gallons of gas?

Back

33 miles per gallon.

Front

How do you determine if one rate is faster than another?

Back

Compare the unit rates. The higher the unit rate, the faster the rate.

Front

A sixth-grade math teacher can grade 25 homework assignments in 20 minutes. What is his grading rate in assignments per minute?

Back

1.25 assignments per minute.

Front

If a teacher grades 36 homework assignments in 30 minutes, what is his grading rate?

Back

1.2 assignments per minute.

Front

Is grading 25 assignments in 20 minutes faster or slower than grading 36 assignments in 30 minutes?

Back

Slower rate.

Front

Which is the slowest reading rate: 3 pages in 9 minutes, 4 pages in 10 minutes, 5 pages in 13 minutes, or 7 pages in 20 minutes?

Back

3 pages in 9 minutes.