Multiplying Rational Numbers

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Multiply rational numbers. SOL: none Objective The student will be able to: Designed by Skip Tyler, Varina High School and Nicole Kessinger Deep Run High.

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Presentation transcript:

Multiplying Rational Numbers

Multiplying Rules 1) If the numbers have the same signs then the product is positive. (-7) • (-4) = 28 2) If the numbers have different signs then the product is negative. (-7) • 4 = -28

Multiplying fractions: Examples 1) (3x)(-8y) -24xy Write both numbers as a fraction. Cross-cancel if possible. Multiplying fractions: top # • top # Bottom # • bottom# = -16

When multiplying two negative numbers, the product is negative. True False Answer Now

When multiplying a negative number and a positive number, use the sign of the larger number. True False Answer Now

Multiply: (-3)(4)(-2)(-3) 72 -72 36 -36 Answer Now

an easy way to determine the sign of the answer When you have an odd number of negatives, the answer is negative. When you have an even number of negatives, the answer is positive. 4) (-2)(-8)(3)(-10) Do you have an even or odd number of negative signs? 3 negative signs -> Odd -> answer is negative -480

Positive or negative answer? Positive - even # of negative signs (4) Write all numbers as fractions and multiply. =12

What is the sign of the product of (-3)(-4)(-5)(0)(-1)(-6)(-91)? Positive Negative Zero Huh? Answer Now

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