Warm Up

1
Warm Up
Multiply or Divide
1. 5(8)
40
72
2. 6(12)
7
4
3.
4.
12
126
5. 18(7)
6.
2
Section 1.6

• Multiplying Dividing Integers

3
Objectives
4
Multiplying Dividing Two Integers
2 Simple Rules
1. Same signs positive
2. Different signs negative
5
Examples
4(3)
Both signs are positive so answer is positive 12
5(-2)
Different signs, so answer will be negative--
-10
(-4)(-6)
Same signs, so answer will be positive 24
(-3)²
-3 times -3, so same signs mean positive answer
9
6
Simplifying Expressions Using Multiplication
-8 (-y)
?
10 (-a)
(-11)(-w)
?
8y
-10a
11w
Because a negative times a negative equals a
positive, your answer is positive
Here, negative times a positive equals a negative
Remember the dot and parentheses next to a
number or letter means to multiply.
7
Lets practice
Multiply or divide.
A. 6(4)
C.
24
9
B. 8(5)(2)
D.
8(5)(2)
40(2)
5
80
8
Lets practice
A. 3(6 12)
B. 5(5 2)
3(6 12)
5(3)
3(18)
15
54
9
Sports Application
A golfer plays 5 holes. On 3 holes, he is 4
strokes over par. On 2 holes, he is 4 strokes
under par. Each score over par can be represented
by a positive integer, and each score under par
can be represented by a negative integer. Find
the total score relative to par.
3(4) 2(4)
12 (8)
4
The golfer's score was 4 over par.
10
Check It Out!
A. -3(-2)(4)
B. -3(6) - 9
24
-18 - 9
- 27
11
Sports Application
A golfer plays 7 holes. On 3 holes, he has a gain
of 3 strokes. On 4 holes, he is 3 strokes under
par. Each score over par can be represented by a
positive integer, and each score under par can be
represented by a negative integer. Find the total
score relative to par.
3(3) 4(3)
9 (12)
3
The golfer's score was 3 under par.
12
try these!
4 ( -6)
-9 -8
?
-5(2)
-24
72
-10
42 -7
-16 2
-3 -3
-6
-8
1
x 5 y -8
-yx
5²(-8)
9x -5
9(5) -5
45 -5
x²y
-(-8)5
25(-8)
-9
40
-200
13
Lesson Quiz
6
1. 8(4)
2.
32
3. 2(13 4)
4. 6(5 3)
18
48
5. Devin completes 11 transactions in his bank
account. In 6 transactions, he withdraws 10. In
5 transactions, he deposits 20. Find the total
net change in dollars.
40
14
Summary

• Rules for multiplying and dividing integers.