Multiplying and Dividing Integers
Dec 30, 2015
Multiplying and Dividing Integers. Multiplying and Dividing Integers. Negative x Negative = Positive Positive x Positive = Positive Negative x Positive = Negative Positive x Negative = Negative When multiplying two numbers, if the signs are the same the answers positive. - PowerPoint PPT Presentation
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Negative x Negative = Positive Positive x Positive = Positive Negative x Positive = Negative Positive x Negative = Negative
When multiplying two numbers, if the signs are the same the answers positive.
If the signs are different, the answer is negative.
To remember whether your answer will be positive or negative when MULTIPLYING or DIVIDING, we’ll use:
When multiplyingIntegers, cover the Two signs you are using
Ex.: 5 (-3)
What sign is left uncovered?
Negative, - That is the sign of The answer= -15
Choral Response
You Try!
(– 10)(3) = 2 – 5 =
– 11 – 6 =
– 30
– 10
66
Division
Good News: It’s not any different!
Ex.: -48 (-4)= + 12
Equal means it works both ways!
8168
16
(14) (-2)
Answer: -7
(-36) (- 3)
5 (-7) (-6)
)3(0
= 12
= 210
= 0
You Try:
Evaluating Variable Expressions
1.Evaluate 6a when a = – 3 6a = 6 (– 3) Answer = -18
2.Evaluate xyz when x = 2, y = – 4 and z = 6xyz = 2(– 4)(6)Answer = – 48
Practice:Multiplying and
Dividing Integers
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