## Lesson: Multiplying and Dividing With Negative Integers

Developing the Concept

You've begun connecting multiplying and dividing negative integers to what your students already know. Now, you will have your students investigate multiplying two negative numbers through the use of patterns and summarize all the rules for multiplying and dividing with negative integers.

**Materials:** two large posters which will be used to summarize the rules for multiplying and dividing with negative integers.

**Wrap-Up and Assessment Hints**

Understanding that addition and subtraction are inverse operations and that multiplication and division are inverse operations are important concepts in justifying the rules for operations with negative integers. When doing subtraction, adding the opposite of the number to be subtracted is the same thing as going in the opposite direction of the number being subtracted.
The rules for dividing with negative integers are basically the same as for multiplying with negative integers. Namely, if the two numbers being divided (or multiplied) are of the same sign, the quotient (or product) is positive.
If the two numbers being divided (or multiplied) are opposite in sign, the quotient (or product) is negative.