1. Lessons 2.3 & 2.4- Multiplying and Dividing Rational Numbers
Objectives:
To multiply and divide integers and rational numbers.

2. Multiplication of Integers
The product of two numbers with the…..
SAME SIGNS is POSITIVE
pos × pos = pos
neg × neg = pos
DIFFERENT SIGNS is NEGATIVE
pos × neg = neg
neg × pos = neg

3. Ex. 1: Find each product. ½ (-8)(-6) 48 (10)(-11) -110 3.
(-0.075)(6.4)
-0.48

4. Your Turn……
(-8.7)(-10.4)
90.48 2.

5. Ex. 2: Simplify 5s(-6t) -30st 2. -7(3d + d) -21d -7d -28d
3. 6x(-7y) + (-15xy)
-42xy + (-15xy)
-57xy
7m(-3n) + 3s(-4t)
-21mn – 12st

6. Ex. 3: Evaluate each expression when m = -2/3, n = ½, p = -3¾

7. In a United States flag, the length of the union is 2/5 of the fly, and the width is 7/13 of the hoist. If the fly is 6 feet, how long is the union?

8. Division of Integers The quotient of two numbers with the…..
SAME SIGNS is POSITIVE
pos ÷ pos = pos
neg ÷ neg = pos
DIFFERENT SIGNS is NEGATIVE
pos ÷ neg = neg
neg ÷ pos = neg
Note: The rules for dividing integers is the same as the rules for multiplying integers.

9. Ex. 4: Divide Integers 1. -60 ÷ (-5) 12 -108/18 -6 -112.23 ÷ 8.7 -12.9
÷ (-5) 12
-108/18 -6
÷ 8.7
-12.9 4.

10. Ex. 2: Simplify 1. 2.

11. 3. 4.

12. Ex. 3: Evaluate each expression when a = 3, b= -4. 5, and c = 7. 5
Ex. 3: Evaluate each expression when a = 3, b= -4.5, and c = Round to the nearest hundredth. 1. 2.

13. During the 2000 holiday season, the sixth most visited online shopping site recorded 419,000 visitors. This is eight times as many visitors as in About how many visitors did the site have in 1999?

14. SUMMARY Multiplying Integers Dividing Integers
SAME SIGNS is POSITIVE
pos × pos = pos
neg × neg = pos
DIFFERENT SIGNS is NEG
pos × neg = neg
neg × pos = neg
SAME SIGNS is POSITIVE
pos ÷ pos = pos
neg ÷ neg = pos
DIFFERENT SIGNS is NEG
pos ÷ neg = neg
neg ÷ pos = neg
NBA #11, page 81, problems even
NBA #12, page 86, problems even