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Objective

Multiply Integers

Vocabulary

None

Multiply Integers

1. Same Sign

Positive Answer

2. Different Signs

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

Answer: –54

Opposite Signs

Multiply numbers without signs9 6

54 Opposite signs , negative answer-

Write problem

9 ( - 6 ) Draw arrows to signs

Identify signs

1/5

Answer: –28

1/5

Answer: –35

Opposite SignsMultiply numbers without signs

5 7

35-

Write problem

- 5 7 Draw arrows to signs

Identify signs

Opposite signs , negative answer

2/5

Answer: –24

2/5

Answer: 63

Same Signs

Multiply numbers without signs7 9

63+

Write problem

7 9 Draw arrows to signs

Identify signs

Same signs, positive answer

3/5

Answer: 20

3/5

Answer: 32

Same Signs

Multiply numbers without signs4 8

32+

Write problem

- 4 ( - 8 ) Draw arrows to signs

Identify signs

Same signs, positive answer

4/5

Answer: 14

4/5

ELEVATORS An elevator takes passengers from the ground floor of a shopping 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?

To find the location of the elevator after 2 seconds, you can multiply 2 by the amount of change per second, –5 feet.

2 ( - 5 )

5/5

Answer: –10 feet

Opposite Signs

Multiply numbers without signs2 5

10-

2 ( - 5 ) Write problem

Draw arrows to signs

Identify signs

Opposite signs , negative answer

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