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 does it mean if two quantities are in proportion?

Back

It means that as one quantity changes, the other quantity changes at a constant rate.

Front

If 1 cm on a map represents 25 km, how many km does 7 cm represent?

Back

175 km.

Front

What is the ratio of dogs to cats if there are 25 dogs and the ratio is 5 to 3?

Back

There are 15 cats.

Front

How can you tell if a table represents a proportional relationship?

Back

A table represents a proportional relationship if the ratios of the corresponding values are equal.

Front

If a recipe calls for 1.5 cups of milk for 3 cups of flour, how much milk is needed for 5 cups of flour?

Back

2.5 cups of milk.

Front

What is the cost of one slice of pizza if a pizza with 8 slices costs $12?

Back

$1.50 per slice.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

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.