In this chapter, students learn to express ratios and rates

as fractions and to solve proportions by using cross

products. Then, using their knowledge of ratios, students

find actual lengths from scale drawings. Students explore

the relationship among fractions, decimals, and percents

as well as find the percent of a number. Students also

learn to solve problems by drawing a diagram.

Youâ€™ll learn

to express ratios and rates as fractions,

to solve proportions by using cross products,

to solve problems by drawing a diagram,

to find actual length from a scale drawing,

to express percents as fractions and as decimals, and

to find the percent of a number.

Knowing how to express ratios as fractions can help you determine better buys in a grocery store.

If the two quantities that you are comparing have different units of measure, the ratio is called a rate.

Write each ratio in three different ways.

1. 9 pairs of boots out of 16 are yellow.

2. 13 bikes out of 16 bikes have combination locks.

3. 18 out of 29 centimeter cubes are pink.

4. 11 brownies out of 15 brownies contain walnuts.

5. 23 out of 25 ants are red.

6. 7 out of 19 days were cloudy.

Geography Refer to the map.

a. Write the ratio that compares the number of states in the Southwestern States region to the total number of states.

b. Write the ratio that compares the number of states in the Midwestern States to the total number of states.