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 transcript:

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 the numbers have different signs then the answer is negative. (-7) 4 = -28

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

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

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

3) = =

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

Examples:

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