Chapter 10

L10-1 Notes:

Ratios

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Vocabulary

A ratio is a comparison of two numbers by division.

                                                                                                       

 

Vocabulary

A common way to express a ratio is as a fraction in simplest form also known as an equivalent ratio.

Write a RATIO in Simplest Form

Write the ratio that compares the number of footballs to the number of tennis balls.

                                                                                                                                                 

           

On Your Own…

Write each ratio as a fraction in simplest form.

1. 3 drums to 18 trumpets

2. 8 gerbils to 36 pets

Vocabulary

A rate is a ratio of two measurements having different kinds of units.

A unit rate is a rate simplified to have a denominator of 1.

On Your Own…

Write each ratio as a unit rate.

1. $9 for 3 cases of soda

2. 25 meters in 2 seconds

Chapter 10

L10-2 Notes:

Solving Proportions

Vocabulary

Proportion is an equation that shows that two ratios are equivalent.

For two ratios to form a proportion, their cross products must be equal.

Solve a Proportion

When one value in a proportion is unknown, you can use cross products to solve the proportion.

1.

Solve a Proportion

2.

On Your Own..

Solve each proportion.

1.

2.

3.