## Lesson: Proportions

Introducing the Concept

Your students will have seen maps in their classes and will have seen their parents use a map when they traveled. Discuss with students how real distances that are large are represented by short distances on a map. However, they can use the map to figure out how far apart those places are by measuring the distance on the map, and using proportions. A day spent using a map to find distances would be well spent.

**Materials:** several copies of Student Map Worksheet (PDF file); overhead ruler; ruler for each student

**Preparation:** Make enough copies of the map to give each student a copy. Make an overhead transparency or a large copy to put on the board in the front of the class.

**Prerequisite Skills:** Students will need to be able to measure distances with a ruler. They will also need to be able to find equivalent fractions by multiplying the numerator and denominator by the same number. Students should also be familiar with solving equations.

Put your overhead transparency map on the overhead projector or the large map on the board up front.