1. 1.8 Dividing Real Numbers Objectives To Divide Real Numbers To evaluate algebraic expressions involving multiplication and division

2. Review: Multiplication Sign Rules Negative times a Negative is Positive Positive times a Positive is Positive Negative times a Positive is Negative Anything times 0 is 0

3. Reciprocal: AKA Multiplicative Inverse NumberReciprocalProduct ¾4/3¾ (4/3) = 1 -6-1/6-6(-1/6) = 1 Zero does not have a reciprocal since the product of any number and 0 is 0. Two nonzero real numbers are reciprocals if their product is zero.

4. Examples Find the reciprocal 1.) 7 1/7 2.) -1/5 -5 3.) 0.6 10/6 = 5/3 = 1.66666 4.) -0.4 -10/4 = -5/2 = -2.5

5. Definition of Division For all real numbers m and n. n ≠ m

6. Divide 5.) -81/3 -27 6.) -1 ½ ÷ -9/7 -3/2 ÷ -9/7 -3/2  -7/9 21/18 7/6 7.) 0/3 0 8.) 17/0 No Solution

7. Evaluate 9.) r [2 ÷ (-s)] if r = 4 and s = -3 r [2 ÷ (-s)] 4 [2 ÷ (-(-3))] 4 [2 ÷ 3] 4 [2/3] 8/3

8. Class Exercises Page 37 1-12 all

9. Homework Practice Exercises Page 38-39 1- 57 odd