Ratios & Unit Rates

Front

What is a ratio?

Back

A ratio is a comparison of two quantities that shows the relative size of one quantity to another, often expressed as 'a to b' or a:b.

Front

How do you calculate a unit rate?

Back

To calculate a unit rate, divide the quantity by the number of units. For example, if you spend $40 on 5 pounds of concrete, the unit rate is $40 ÷ 5 = $8 per pound.

Front

What is the unit rate of 120 customers in 8 hours?

Back

15 customers per hour (120 ÷ 8 = 15).

Front

If Justin types 408 words in 4 minutes, how many words does he type per minute?

Back

102 words per minute (408 ÷ 4 = 102).

Front

What is the ratio of red apples to green apples if there are 4 red apples and 3 green apples?

Back

The ratio is 4 red apples to 3 green apples, or 4:3.

Front

What does it mean if a unit rate is expressed in dollars per pound?

Back

It means the cost of one pound of a product is being compared to its total cost.

Front

How do you express the ratio of red toy cars to all toy cars if Patrick has 2 black, 3 red, and 5 white toy cars?

Back

The total number of toy cars is 10 (2 + 3 + 5). The ratio of red toy cars to all toy cars is 3:10.

Front

What is the formula for finding a unit rate?

Back

Unit Rate = Total Quantity ÷ Number of Units.

Front

If a recipe calls for 2 cups of flour for every 3 cups of sugar, what is the ratio of flour to sugar?

Back

The ratio of flour to sugar is 2:3.

Front

What is the unit rate of 50 miles driven in 2 hours?

Back

25 miles per hour (50 ÷ 2 = 25).