Multiplying

1
Multiplying Dividing Integers
2
Mr. Multidivision
-
-

3
Examples
X
-15
Ex. 1) (-5)(3)
X
X
X
36
Ex. 2) (-12)(-3)
X
-81
Ex. 3) (9)(-9)
X
4
On Your Own
X
-21
Ex. 1) (-7)(3)
X
X
X
72
Ex. 2) (-9)(-8)
X
-30
Ex. 3) (5)(-6)
X
5
Rules
What rules can we create based on the last 6
problems?
same

1. When you have the ______ signs, the answer will
   be ________.
2. When you have __________ signs, the answer will
   be _________.

positive
different
negative
6
Practice
-32
-24
6
-9
7

• Multiplying Three or More Integers
• To multiply three or more integers, work from
  left to right, multiplying two numbers at a time,
  continue all the way to end

8
Multiplying Three or More Integers

• Example 5 Find the product
• 2( -3)(4)
• 3(-2)(-5)
• (-3)(-4)(-2)(-1)
• (-1)(-1)(-1)(-1)(-1)
• Solution
• 2(-3)(4) -6(4) -24
• 3(-2)(-5) -6(-5) 30
• (-3)(-4)(-2)(-1) 12(-2)(-1) -24(-1) 24
• (-1)(-1)(-1)(-1)(-1) -1
  

Do you see a pattern here?