Proportions and Equivalent Ratios

Front

What is a proportion?

Back

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

Front

What is an equivalent ratio?

Back

Equivalent ratios are two or more ratios that express the same relationship between numbers.

Front

If 2/3 of a pizza is left, what is the equivalent ratio of pizza left to total pizza?

Back

The equivalent ratio is 2:3.

Front

How do you find a missing value in a proportion?

Back

You can use cross-multiplication to find a missing value in a proportion.

Front

What is the cross-multiplication method?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

If 4/5 of a class are girls, what is the ratio of girls to boys if there are 20 students in total?

Back

The ratio of girls to boys is 16:4 or 4:1.

Front

How can you determine if two ratios are equivalent?

Back

Two ratios are equivalent if they can be simplified to the same fraction.

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 formula for finding equivalent ratios?

Back

To find equivalent ratios, multiply or divide both terms of the ratio by the same non-zero number.

Front

If a car travels 60 miles in 1 hour, how far will it travel in 3 hours?

Back

The car will travel 180 miles in 3 hours.