Quick Review Find each sum: 1. 5 + 5 + 5 + 5 + 5 2.(-3) + (-3) + (-3) Answers: 1.25 2.-9.

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Presentation transcript:

Quick Review Find each sum: (-3) + (-3) + (-3) Answers:

Multiplying and Dividing Integers Section 1-8 (page 45-49)

Rules To multiply a positive and negative integer, think of multiplication as repeated addition. Example: A cave explorer descends 4ft/min for 3 minutes. 3 (-4) = (-4) + (-4) + (-4) = -12

Rules You can use number lines to multiply integers. 3(2) means three groups of

Rules The product of two integers with the same sign is positive. 3(2) = 6-3(-2) = 6 The product of two integers with different signs is negative. 3(-2) = -6-3(2) = -6

Find each sum… 1. 5(3) 2. 5(-3) 3. -5(3) 4. -5(-3) same sign, positive product different sign, negative product same sign, positive product

Additional Problems * (2)= * (-8) = * (-6) = ÷ (-1) =

Rules The quotient of two integers with the same sign is positive. 10 ÷ 2 = ÷ (-2) = 5 The quotient of two integers with different signs is negative. -10 ÷ 2 = ÷ (-2) = -5

Find each quotient… ÷ ÷ ÷ (-2) ÷ (-2) same sign, positive product different sign, negative product same sign, positive product

Additional Problems ÷ (-2) = ÷ (-8) = ÷ (-7) = ÷ 11 =