1. Multiplying INTEGERS

2. Discovery Activity
With a partner, complete both parts to the “Discover the Math” activity on pages

3. Discovery Activity Part 1 What is the pattern you see?
What is your rule for multiplying a positive number by a negative number?
Would the rule be the same for multiplying a negative number by a positive number?
Part 2
What is your rule for multiplying a negative number by a negative number?

4. Find Integer Products Examples -4 x 3 =
How: The signs are different, so the product is negative
5 x (-2) =
-7 x (-4) =
How: The signs are the same,
so the product is positive
Vid to Enjoy
Multiplying Integers Song (So Epic!)
-12
-10 28

5. Applying Integer Multiplication (Problems)
Example
Six students each owe $5 for
a field trip. What is the total
amount owed? What integer
rule does this illustrate?
Solution:
6 x (-5) = -30
The six students owe a total of $30. This is -$30. This illustrates that the product of a positive number and a negative number is negative.

6. Multiplying More Than 2 Integers
Examples
5 x (-9) x (-3)
= -45 x (-3)
= 135
-2 x (-4) x (-7) x 2
= 8 x (-7) x 2
= -56 x 2
= -112
I used the order of operations and multiply from left to right.

7. Multiplication Rules When you multiply 2 integers,
If the signs are the same, the product is positive
(5 x 5 = 25; -4 x (-4) = 16)
If the signs are different, the product is negative
(5 x (-5) = -25; -5 x 5 = -25)