Writing and Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and set the products equal to each other.

Front

If 8 slices of pizza cost $12, what is the cost of one slice?

Back

$1.50

Front

If there are 5 ice cream cones for every 3 brownies, how many cones are there for 24 brownies?

Back

40 ice cream cones.

Front

What is the formula to find the unit rate?

Back

Unit Rate = Total Amount / Number of Units.

Front

If a car travels 120 miles in 3 hours, what is its speed in miles per hour?

Back

40 miles per hour.

Front

How do you find the missing value in a proportion?

Back

Set up the proportion and cross-multiply to find the missing value.

Front

If Mike takes 18 minutes to read 4 pages, how long will it take him to read 30 pages?

Back

135 minutes.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Front

How can you check if two ratios form a proportion?

Back

Cross-multiply and see if the products are equal.