2.4 Multiplying and Dividing Real Numbers Objectives: Multiply and divide positive and negative numbers. Define properties of zero. Standards Addressed: H: Explain multiplication and division algorithms B: Discover, describe, and generalize patterns. Ex. 1 d. ( 8)(-6) = -48 e. (-4)(-5.3) = 21.2 f. (-7)(2.6) = -18.2 Ex. 2 * -16/4 = -4 * (-3.2) (-0.8) = 4 * -25 5 = -5 The Multiplicative Identity and Reciprocals Ex. 3 -49 -7 = 7 5/9 3 = 5/27 2/3 -4/5 = -5/6 Properties of Zero Ex. 4 (-45) (0) = 0 17 0 = undefined 0 27 = 0