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Multiplying and Dividing Integers

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.

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Multiplying and Dividing Integers

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  1. Multiplying and Dividing Integers

  2. 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. • If the signs are different, the answer is negative.

  3. Here’s a way I can Remember! • To remember whether your answer will be positive or negative when MULTIPLYING or DIVIDING, we’ll use:

  4. When multiplying Integers, cover the Two signs you are using Choral Response What sign is left uncovered? Ex.: 5 (-3) Negative, - That is the sign of The answer = -15

  5. You Try! (– 10)(3) = – 30 2  – 5 = – 10 – 11  – 6 = 66

  6. Division It’s not any different! Good News: Ex.: -48  (-4) = + 12

  7. Reminder: Equal means it works both ways! 

  8. You try… • (14)  (-2) Answer: -7

  9. You Try: = 12 (-36)  (- 3) = 210 5  (-7)  (-6) = 0

  10. Evaluating Variable Expressions • Evaluate 6a when a = – 3 • 6a = 6 (– 3) • Answer = -18 • Evaluate xyz when x = 2, y = – 4 and z = 6 • xyz = 2(– 4)(6) • Answer = – 48

  11. Practice: Multiplying and Dividing Integers

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