1. A2. B3. C4. D

A. –9 B. –1 C. 1 D. 9

Find 4 – 5.

(over Lesson 2-5)

Find –14 – 34.A. –48 B. –20 C. 20 D. 48

Find –45 – (–8).

A. –53 B. –37 C. 37 D. 53

Main IdeaKey Concept: Multiply Integers with Different SignsExample 1: Multiple Integers with Different SignsExample 2: Multiple Integers with Different SignsKey Concept: Multiply Integers with Same SignExample 3: Multiply Integers with the Same SignExample 4: Multiply Integers with the Same SignExample 5: Multiply Integers with the Same Sign

• Multiply integers (2.2.8B) (M8.A.3.3.1).

Multiply Integers with Different Signs

Find 5(–4).

Answer: –20

5(–4) = –20 The integers have different signs. The product is negative.

1. A2. B3. C4. D

A. –15

B. –2

C. 2

D. 15

Find 3(–5).

Multiply Integers with Different Signs

Find –3(9).

Answer: –27

–3(9) = –27 The integers have different signs. The product is negative.

1. A2. B3. C4. D

A. –35

B. 2

C. 12

D. 35

Find –5(7).

Multiply Integers with the Same Sign

Find –6(–8).

Answer: 48

–6(–8) = 48 The integers have the same sign. The product is

positive.

1. A2. B3. C4. D

A. –28

B. –11

C. 11

D. 28

Find –4(–7).

Find (–8)2.

Answer: 64

Multiply Integers with the Same Sign

(–8)2 = (–8)(–8) There are two factors of –8.

= 64 The product is positive.

1. A2. B3. C4. D

A. –25

B. –10

C. 10

D. 25

Find (–5)2.

Find –2(–5)(–6).

Answer: –60

Multiply Integers with the Same Sign

–2(–5)(–6) = [–2(–5)](–6)Associative Property

= 10(–6) –2(–5) = 10

= –60The

product is negative.

1. A2. B3. C4. D5. D

A. 84

B. –14

C. 14

D. –84

Find –7(–3)(–4).

REVIEW

Multiply.

1. 6(-10)

2. 11(-4)

3. -2(14)

4. -8(5)

5. -15(-3)

6. -7(-9)

7. (-8)2

8. (-3)

9. -1(-3)(-4)

10. 2(4)(5)

3

-60

-44-28-40456364

-27-12

40

End of the Lesson

Five-Minute Check (over Lesson 2–5)

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Math Tools

Adding Integers

Comparing and Ordering Integers

Subtracting Positive and Negative Integers