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2.1 Day 3:Multiplying more than two integers
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• When multiplying many integers, you can multiply from left to right
Multiplying Many Integers
For example,3(-4)(-2)
Do the first two numbers
(-12)(-2)
24
Simplify
-1 (-1)1
Simplify
-1(-1)(-1)1(-1)
-1
Simplify
-1(-1)(-1)(-1)1(-1)(-1)
-1(-1)1
Simplify
-1(-1)(-1)(-1)(-1)1(-1)(-1)(-1)
-1(-1)(-1)1(-1)
-1
Simplify
-1(-1)(-1)(-1)(-1)(-1)1(-1)(-1)(-1)(-1)
-1(-1)(-1)(-1)1(-1)(-1)
-1(-1)1
See a Pattern??
What is the sign when there is an even number of negative
signs?Positive
See a Pattern?
What is the sign when there are an odd number of negative signs?
Negative
Rule:
When multiplying Integers,• If there is an even number of negative factors
the product is positive• If there is an odd number of negative factors
the product is negative
Tell whether the answer is positive or negative
3(2)(-3)Negative
3(-2)(-3)Positive
3(2)(-3)(4)(-1)Positive
5(8)(-4)(2)(-3)(-4)Negative
Try these: Multiply
1.) 15(-9) (-1)Answer will be
positive285(1)
285
2.) -3 (-6)(-2)Answer will be
negative18(2)-36
Homework
• Worksheet