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 1 cm on a map represents 25 km, how many km does 4 cm represent?

Back

100 km.

Front

What is the unit rate?

Back

The unit rate is a comparison of any two units, expressed as a quantity of one unit.

Front

How do you find the unit price of an item?

Back

Divide the total price by the number of units.

Front

If a recipe calls for 2 cups of flour for 4 servings, how much flour is needed for 10 servings?

Back

5 cups of flour.

Front

What is the scale factor in similar figures?

Back

The scale factor is the ratio of the lengths of corresponding sides of two similar figures.

Front

If 150 people wait 20 minutes, how long will 240 people wait?

Back

32 minutes.

Front

What is the relationship between the sides of similar triangles?

Back

The ratios of the lengths of corresponding sides of similar triangles are equal.

Front

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

Back

180 miles.