## Lesson: Adding and Subtracting With Negative Numbers

Introducing the Concept

Your students have used number lines in the past to add and subtract whole numbers. Relating the addition and subtraction of negative numbers to that of whole numbers will help your students understand how to operate with negative numbers. It's important to reinforce the meanings of *addition* and *subtraction* in terms of moving left and right on the number line.

**Materials:** Large number line, student number lines

**Prerequisite Skills and Concepts:** Students need to be familiar with how to add and subtract whole numbers on a number line.

Place the large number line you created on a wall in front of the class so that all the students can see it. You could also use a number line drawn on an overhead transparency and shown on the wall.