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 terms and then solve for the unknown variable.

Front

If 3 boxes take 1 hour to pack, how many boxes can be packed in 4 hours?

Back

12 boxes

Front

If 50 apples cost $25, what is the cost of 1 apple?

Back

$0.50

Front

What is the unit rate?

Back

The unit rate is the ratio of two measurements in which the second term is 1.

Front

If a car travels 120 miles in 2 hours, what is its speed in miles per hour?

Back

60 miles per hour

Front

How do you find the missing value in a proportion?

Back

Set up the proportion, cross-multiply, and solve for the missing value.

Front

If 4 pages take 18 minutes to read, how long does it take to read 1 page?

Back

4.5 minutes

Front

What is the formula for finding the cost per item?

Back

Cost per item = Total cost / Number of items.

Front

If 75 apples cost $37.50, what is the cost of 3 apples?

Back

$1.50