7th Grade Math

Extra Practice EP9

Extra Practice

Multi-Part Lesson: 3-3 (continued)

PART C PAGES 166–167

Use the draw a diagram strategy to solve the following problems.

1. TESTS The scores on a test are found
   by adding or subtracting points as
   shown below. If Salazar’s score on a
   15-question test was 86 points, how
   many of his answers were correct,
   incorrect, and blank?

Answer Points

Correct + 8

Incorrect - 4

No answer - 2

2. GAMES Six members of a video game
   club are having a tournament. In the
   first round, every player will play a
   video game against every other player.
   How many games will be in the first
   round of the tournament?


3. FAMILY At Latrice’s family reunion,
   _^45 of the people are 18 years of age or
   older. Half of the remaining people
   are under 12 years old. If 20 children
   are under 12 years old, how many
   people are at the reunion?

PART D PAGES 168–173

Divide. Write in simplest form.

1. 32 ÷ ^32 2. ^35 ÷ ^25 3. 107 ÷ ^38


2. ^59 ÷ 52 5. 4 ÷ 32 6. 8 ÷ ^45


3. 9 ÷ ^59 8. ^27 ÷ 2 9. _ 141 ÷ 7


4. 15 ÷ 53 11. 149 ÷ 43 12. ^78 ÷ 10


5. 16 ÷ ^34 14. ^38 ÷ 2 ^12 15. 5 ^12 ÷ 2 _^12


6. 3 41 ÷ 5 ^12 17. 12 ^56 ÷ 2 ^16 18. 7 ^12 ÷ 3 ^12

Multi-Part Lesson 3-4: Monomials

PART A PAGES 176–180

Find each product or quotient. Express using exponents.

1. 23 · 24 2. 56 · 5 3. t-^4 · t^2


2. y^5 · y^3 5. (- 3 x^3 )(- 2 x^2 ) 6. b^12 · b


3. 35 · 38 8. (- 2 y^3 ) (5y-^7 ) 9. (6a^5 )(- 3 a^6 )


4. 7

9

_

76

11. 2

5

_

22

12. 11

10

_ 11

13. 16 x

3

_

4 x^2

14.

25 y^5

_

5 y^2

15.

• 48 y^3
  _- 8 y

16.

12 y-^5

_

3 y^2

17.

39 x^7 y^5

_

3 x^3 y

18. 21 a

(^7) b 2
_
7 ab^2
EP2_EP36_ExtPract_M1_895130.indd EP9 1/6/10 11:46 AM