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Fill in planner and HWRS HW: p #10-13, 38-41 Complete answers: Show your Work! Get a signature on your HWRS On desk: math journal, HWRS, pencil Warm Up: In your journal: /23/14 Investigation 3: Multiplying and Dividing Rational Numbers AN 3.2 Multiplication of Rational Numbers What algorithm can you use for multiplying integers?
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Positive Factors One Negative Factor Two Negative Factors
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+6 Yes, multiplication is commutative! The order of the factors doesn’t matter. +6 - 6 Positive x Positive = Positive Positive x Negative = Negative Negative x Positive = Negative
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Negative x Negative = Positive
When there are zero or an even number of negative factors , the product is positive! When there is one or an odd number of negative factors, the product is negative!
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Positive Negative Positive Negative Positive When there are zero or an even number of negative factors , the product is positive! When there is one or an odd number of negative factors, the product is negative!
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Multiplying Integers - Rules
Positive x Positive = Positive Positive x Negative = Negative Negative x Positive = Negative Negative x Negative = Positive
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How do the products change as the numbers multiplied by 5 decrease?
As the number multiplied by 5 decreases by 1, the product decreases by 5
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With each equation, there is one fewer group of 5.
5 less than 0 is -5 10 less than 0 is -10 15 less than 0 is -15
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The product increases each time because you are accumulating fewer negatives (one less group of -4)
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Each of the products is the opposite of the product of 4 and a negative number.
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Complete answers: Show your Work!
Homework p #10-13, 38-41 Complete answers: Show your Work!
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