Multiplication and Division of Integers Lesson 2 4

Multiplication and Division of Integers Lesson 2 -4 and 2 -5

Multiplication of Integers Negative and Positive × Negative = ________ Negative × Positive = ________ Negative If the signs in a multiplication problem are different the solution is: ________ I know that a: Positive positive × positive = _______ Negative (+)(–) = _______ Now follow the pattern: Negative (–)(+) = _______ Positive (+)(+) = _______ So… I know that a: Positive (–)(–) = _______ Positive negative × negative = _____________ Positive If the signs in a multiplication problem are the same the solution is: ________

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

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

Grade your teacher’s work… • • (4)(-7) (-2) First, (4)(-7) = - 28 • Finish it! (-28) (-2) Answer: 14

1. -8 * 3 -24 2. -2 * -61 122 Different Signs Negative Answer 4. 6 ÷ (-3) -2 Start inside ( ) first 5. - (20/-5) - (-4) 4 3. (-3)(6)(1) (-18)(1) -18 Same Signs Positive Answer 6. 68

Simplify each Expression… - 3 (6 y) = -18 y -7 x (-4 y) = 28 xy 2 n (-6 m) (-5 p) = 60 nmp

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

Reminder: Remember, a fraction is just a division problem.

Try these… (-56 7) - 2 5 -7 -6 =4 = 210 = - 135 -5 x y If x = -6 y = -3 = - 10

Assignment Time Page 88 # 1 - 10 Page 95 # 17 - 27