Ratio and Rates Review

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 one unit. For example, if you travel 60 miles in 2 hours, the unit rate is 30 miles per hour.

Front

Which of the following is NOT a unit rate? 1) 45 miles per hour 2) 27 sandwiches in 3 weeks 3) 2 cars 4) 1 lane

Back

27 sandwiches in 3 weeks is NOT a unit rate because it does not express a quantity per one unit.

Front

How do you calculate the unit rate of students per class if there are 88 students in 4 classes?

Back

To find the unit rate, divide the total number of students by the number of classes: 88 students ÷ 4 classes = 22 students per class.

Front

If 13 out of 20 homes have a personal computer, how many homes would you expect to have a computer on a street with 60 homes?

Back

To find the expected number of homes with a computer, set up a proportion: (13/20) = (x/60). Solving gives x = 39 homes.

Front

In a recipe, if 2 eggs are used to make 30 cookies, how many cookies can be made with 4 eggs?

Back

If 2 eggs make 30 cookies, then 4 eggs would make 60 cookies (30 cookies × 2).

Front

What is the missing number in the ratio table if the options are 72, 85, 76, 90?

Back

The missing number in the ratio table is 76.

Front

What is a ratio?

Back

A ratio is a relationship between two numbers indicating how many times the first number contains the second.

Front

How do you express a ratio of 3 to 4?

Back

The ratio of 3 to 4 can be expressed as 3:4 or 3/4.

Front

What is the difference between a ratio and a rate?

Back

A ratio compares two quantities, while a rate compares two quantities with different units, such as miles per hour.

Front

If a car travels 150 miles in 3 hours, what is the unit rate in miles per hour?

Back

The unit rate is 150 miles ÷ 3 hours = 50 miles per hour.