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

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 12 ounces of shampoo lasts 16 weeks, how long will 18 ounces last?

Back

24 weeks.

Front

A car travels 50 miles in 40 minutes. How far does it travel in 20 minutes?

Back

25 miles.

Front

What is the formula for finding a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

Front

How can proportions be used in real-life situations?

Back

Proportions can be used to solve problems involving scaling, such as recipes, maps, and model building.

Front

What is the relationship between ratios and proportions?

Back

Ratios are the building blocks of proportions; a proportion states that two ratios are equal.

Front

If x/5 = 3/15, what is x?

Back

x = 1.