Quick Start Expectations

1. Quick Start Expectations Investigation 3: Multiplying and Dividing Rational Numbers Fill in planner and HWRS HW: p. 66-74 #10-13, 38-41 Complete answers: Show your Work! Get a signatureon your HWRS On desk: math journal, HWRS, pencil Warm Up: In your journal: 10/23/14 AN 3.2 Multiplication of Rational Numbers What algorithm can you use for multiplying integers?

3. Two Negative Factors Positive Factors One Negative Factor

4. +6 Yes, multiplication is commutative! The order of the factors doesn’t matter. +6 - 6 Positive x Positive = Positive Positive x Negative= Negative Negativex Positive= Negative

5. Negativex Negative= Positive Positive, 168 Negative, -240 Negative, -1 When there are zero or an even number of negative factors , the product is positive! When there is one or an odd number of negative factors, the product is negative!

6. Positive Negative Positive Negative Positive When there are zero or an even number of negative factors , the product is positive! When there is one or an odd number of negative factors, the product is negative!

7. Multiplying Integers - Rules Positive x Positive = Positive Positivex Negative = Negative Negative x Positive= Negative Negativex Negative= Positive

8. How do the products change as the numbers multiplied by 5 decrease? As the number multiplied by 5 decreases by 1, the product decreases by 5

9. With each equation, there is one fewer group of 5. • 5 less than 0 is -5 • 10 less than 0 is -10 • 15 less than 0 is -15

10. The product increases each time because you are accumulating fewer negatives (one less group of -4)

11. Each of the products is the opposite of the product of 4 and a negative number.

12. Homework p. 66-74 #10-13, 38-41 Complete answers: Show your Work!