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**2.1 Day 3: Multiplying more than two integers**

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**Multiplying Many Integers**

When multiplying many integers, you can multiply from left to right For example, 3(-4)(-2) Do the first two numbers (-12)(-2) 24

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Simplify -1 (-1) 1

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Simplify -1(-1)(-1) 1(-1) -1

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**-1(-1)(-1)(-1) 1(-1)(-1) -1(-1) 1**

Simplify -1(-1)(-1)(-1) 1(-1)(-1) -1(-1) 1

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**-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

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Simplify -1(-1)(-1)(-1)(-1)(-1) 1(-1)(-1)(-1)(-1) -1(-1)(-1)(-1) 1(-1)(-1) -1(-1) 1

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See a Pattern?? What is the sign when there is an even number of negative signs? Positive

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See a Pattern? What is the sign when there are an odd number of negative signs? Negative

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**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

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**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

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**285(1) 285 Try these: Multiply 1.) 15(-9) (-1) Answer will be positive**

2.) -3 (-6)(-2) Answer will be negative 18(2) -36

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Homework Worksheet

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