## Lesson: Using Ratios and Percents

Introducing the Concept

Your students have already worked with fractions and decimals, but they might not see the connection between them and ratios and percents in their daily lives. To spark their interest, discuss topics like test scores, sports statistics, or percent of students earning As and Bs.

**Materials:** none

**Preparation:** none

**Prerequisite Skills and Concepts:** Students should know equivalent fractions, simplest form, and multiplying fractions. They should also know how to multiply decimals.

Tell students that they will learn to write a ratio as a percent and a percent as a ratio.

On the chalkboard show students a drawing of a group of five geometric shapes—3 squares and 2 circles.