## Lesson: Using Ratios and Percents

Developing the Concept

Now that students are familiar with ratios, decimals, and percents, they can apply this knowledge when solving problems.

**Materials:** overhead projector; Music Styles (PDF file) worksheet for each student or group of students

**Preparation:** Make a transparency of the worksheet. Distribute copies of the worksheet to each student or group of students.

**Wrap-Up and Assessment Hints**

Make sure students understand that a ratio of 1 to 4, even though it can be written in fraction form, doesn't always mean the same as the fraction .

Discuss the example of a paint mixture of 1 part yellow and 4 parts red, a ratio of 1 to 4, yet the mixture contains yellow paint.

To assess whether students understand the meaning of fractions, decimals, and percents, ask them to do mental math exercises to pick the greater number of a pair of numbers. Following are a few examples.

1. or 50% (50% > 30%)

2. 73% or (75% > 73%)

3. 0.45 or (0.48 > 0.45)