MULTIPLICATION OF INTEGERS

1
MULTIPLICATION OF INTEGERS

• 1-9

2
RULES FOR MULTIPLYING INTEGERS

• The product of two integers with the SAME SIGN is
  positive.
• The product of two integers with DIFFERENT SIGNS
  is negative.
• The product of zero and any integer is zero.

3
EXAMPLES FOR THE RULES



Same Sign
3(4) 12
-3(-4) 12
Different Signs
-3(4) -12
3(-4) -12
Zero
3(0) 0
-3(0) 0
4
TRICK

• Multiply your numbers like normal
• Count up the negative signs
• If there is an ODD amount of negative signs, the
  answer will be NEGATIVE
• If there is an EVEN amount of negative signs, the
  answer will be POSITIVE

5
EXAMPLES

• 1.) 2(-6)
• -12
• 2.) 4(-5)
• -20
• 3.) -7(-2)
• 14

6
WORD PROBLEM

• After it is launched from a boat, Sea Rover
  descends 60 feet per minute. Where is it in
  relation to sea level three minutes after its
  launch?
• Directions Use a number line to show repeated
  addition.

-180 -120
-60
0
3(-60) -180
Therefore, Deep Rover is at 180 ft., or 180 ft.
below sea level.