1. 2.4 Multiplying and Dividing Real Numbers Objectives: Multiply and divide positive and negative numbers. Define properties of zero. Standards Addressed: 2.2.5.H: Explain multiplication and division algorithms. 2.8.8.B: Discover, describe, and generalize patterns.

3. Ex. 1

4. d. ( 8)(-6) = -48 e. (-4)(-5.3) = 21.2 f. (-7)(2.6) = -18.2

5. Ex. 2

6. * -16/4 = -4 * (-3.2) ÷ (-0.8) = 4 * -25 ÷ 5 = -5

7. The Multiplicative Identity and Reciprocals

8. Ex. 3

9. -49 ÷ -7 = 7 5/9 ÷ 3 = 5/27 2/3 ÷ -4/5 = -5/6

10. Properties of Zero

11. Ex. 4

12. (-45) (0) = 0 17 ÷ 0 = undefined 0 ÷ 27 = 0