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Multiplication of Real Numbers Section 2.5. Multiplying Rules 1) If the numbers have the same signs then the answer is positive. (-7) (-4) = 28 2) If.

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Presentation on theme: "Multiplication of Real Numbers Section 2.5. Multiplying Rules 1) If the numbers have the same signs then the answer is positive. (-7) (-4) = 28 2) If."— Presentation transcript:

1 Multiplication of Real Numbers Section 2.5

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

3 Examples 1) (3x)(-8y) 2) Write both numbers as a fraction. =-16 Multiplying fractions: (multiply across) -24xy

4 When multiplying two negative numbers, the product is negative. 1.True 2.False Answer Now

5 When multiplying a negative number and a positive number, use the sign of the larger number. 1.True 2.False Answer Now

6 3) = =

7 Multiply: (-3)(4)(-2)(-3) 1.72 2.-72 3.36 4.-36 Answer Now

8 Examples: 1. 2. 3.

9 What is the sign of the product of (-3)(-4)(-5)(0)(-1)(-6)(-91)? 1.Positive 2.Negative 3.Zero 4.No stinkin’ clue Answer Now

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