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Objective
Multiply Integers
Vocabulary
None
Multiply Integers
1. Same Sign
2. Different Signs
Positive Answer
Negative Answer
3  4 = 12
3  -4 = -12
-3  -4 = 12
-3  4 = -12
Example 1 Multiply Integers with Different Signs
Example 2 Multiply Integers with Different Signs
Example 3 Multiply Integers with Same Signs
Example 4 Multiply Integers with Same Sings
Example 5 Use Integers to Solve a Problem
Find 9  (-6)
9  (-6)
Opposite Signs
9  6
Answer: - 54
Write problem
Draw arrows to signs
Identify signs
Multiply numbers without signs
Opposite signs , negative answer
1/5
Find 4  (-7)
Answer: –28
1/5
Find - 5  7
-5  7
Opposite Signs
5  7
Answer: - 35
Write problem
Draw arrows to signs
Identify signs
Multiply numbers without signs
Opposite signs , negative answer
2/5
Find - 8  3
Answer: –24
2/5
Find 7  9
7  9
Same Signs
7  9
Answer: + 63
Write problem
Draw arrows to signs
Identify signs
Multiply numbers without signs
Same signs, positive answer
3/5
Find 5  4
Answer: 20
3/5
Find - 4  (- 8)
-4  (-8)
Same Signs
4  8
Answer:
+ 32
Write problem
Draw arrows to signs
Identify signs
Multiply numbers without signs
Same signs, positive answer
4/5
Find - 2  (- 7)
Answer: 14
4/5
ELEVATORS An elevator takes passengers from the
ground floor of a mall down to the underground parking
garage. If it travels at a rate of 5 feet per second, where
will it be in relation to the ground floor after 2 seconds?
-5  2
Determine process to use
“Rate” refers to distance
multiplied by time
Identify distance
Elevator is going down so
number is negative
Identify time
5/5
-5  2
Draw arrows to signs
Identify signs
Opposite Signs
Multiply numbers without signs
5  2
Opposite signs , negative answer
Answer: - 10 feet
Add dimensional analysis
If it travels at a rate of 5 feet
per second,
Distance is in feet
5/5
*
INVESTMENTS Mr. Green has invested in a stock
whose price is decreasing at a rate of $3 per day.
What will be the change in the price of the stock after
5 days?
Answer:
– $15
5/5
Assignment
Lesson 8:4
Multiplying Integers
11 - 31 All