## Lesson: Adding and Subtracting With Negative Numbers

Developing the Concept

**Materials:** Large number line up front for the class to see; student number lines

**Wrap-Up and Assessment Hints**

Students should be allowed to create and use number lines during assessment. You may want to encourage more advanced students to practice adding and subtracting with negative numbers without using a number line. You might also give students problems with negative numbers that test their understanding of the properties of addition.