Proportional Relationships

Front

What is a proportional relationship?

Back

A proportional relationship is a relationship between two quantities where the ratio of one quantity to the other quantity is constant.

Front

If 16 hot dogs are sold each minute, how many hot dogs are sold in 30 minutes?

Back

480 hot dogs.

Front

How do you find the unit rate from a total amount?

Back

Divide the total amount by the number of units. For example, if Samantha earned $90 for 6 hours, the unit rate is $90 ÷ 6 = $15 per hour.

Front

What is the unit rate if Samantha earned $90 for working 6 hours?

Back

$15 per hour.

Front

If 1 container of frosting is used for every 36 cupcakes, how many containers are needed for 300 cupcakes?

Back

9 containers.

Front

How do you calculate the number of items needed based on a ratio?

Back

Use the ratio to set up a proportion. For example, if 1 container frosts 36 cupcakes, for 300 cupcakes, set up the proportion: 1/36 = x/300.

Front

If Toby brings 3 brownies every week, how many brownies will he bring in 5 weeks?

Back

15 brownies.

Front

What is the ratio of boys to girls in the 7th grade if there are 3 boys for every 5 girls?

Back

The ratio is 3:5.

Front

If there are 70 girls in the 7th grade, how many boys are there if the ratio is 3 boys for every 5 girls?

Back

42 boys.

Front

How do you solve for an unknown in a proportional relationship?

Back

Set up a proportion and cross-multiply to solve for the unknown.