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Lesson 2-4 and 2-5 Multiplication and Division of Integers Lesson 2-4 and 2-5
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Multiplication of Integers Negative × Positive = _______________ and Positive × Negative = _______________ If the signs in a multiplication problem are different the solution is:_______________ I know that a: positive × positive = ______________ Now follow the pattern:(+)(–) = ______________ (–)(+) = ______________ (+)(+) = ______________ So…(–)(–) = ______________ I know that a:negative × negative = _________________________ If the signs in a multiplication problem are the same the solution is:_______________ Negative Positive Negative Positive
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Here’s a way I can Remember! To remember whether your answer will be positive or negative when MULTIPLYING or DIVIDING, we’ll use: Mr. Multiplivision
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When multiplying Integers, cover the Two signs you are using Ex.: 5 (-3) What sign is left uncovered? Negative, - That is the sign of The answer = -15
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Grade your teacher’s work… (4)(-7) (-2) First, (4)(-7) = - 28 Finish it! (-28) (-2) Answer: 14
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1. -8 * 3 Different Signs Negative Answer -24 2. -2 * -61 Same Signs Positive Answer 122 3. (-3)(6)(1) (-18)(1) -18 4. 6 ÷ (-3) -2 5. - (20/-5) - (-4) 4 6. 68 Start inside ( ) first
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Simplify each Expression… - 3 (6y) = -18y -7x (-4y) = 28xy 2n (-6m) (-5p) = 60nmp
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Division Good News: It’s not any different! Ex.: -48 (-4) = + 12
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Reminder: Remember, a fraction is just a division problem.
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(-56 7) - 2 5 -7 -6 = 4 = 210 = - 135 Try these… -5x y If x = -6 y = -3 = - 10
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Assignment Time Page 88 # 1 - 10 Page 95 # 17 - 27
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