UNIT 4

Review

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

16 17 18 19 20

21 22 23 24 25

#1

1 7

6 9w

#1 Answer

W = 243

#2

a – 2.7 = 4.8

#2 Answer

a = 7.5

#3

The area of Yvonne’s bedroom is 180 ft². If its length is 12 ft, what is its width?

# 3 Answer

width = 15

#4

106

t

#4 Answer

t = 60

#5

What does “inverse operation” mean?

#5 Answer*To “undo” an operation

*The opposite of an operation

The inverse operation of addition is subtraction

The inverse operation of subtraction is addition

The inverse operation of multiplication is division

The inverse operation of division is multiplication

#6

59

6a

#6 Answer

a = 4

105

#7

What is the difference between an equation and an expression?

#7 Answer

An equation has an equal sign, and an expression doesn’t have an equal sign

#8

h + 34 = 87

#8 Answer

h = 53

#9

t – 6.08 = 12.59

#9 Answer

t = 18.67

#10

What is the product of 10 and 13 decreased by j when j = 40?

#10 Answer

(10 • 13) – 40

90

#11

Solve wx – y + z; when w = 10,

x = 8, y = 20, z = 15

#11 Answer

75

#12

Solve (order of operations)

24 20 (3 7)

#12 Answer

8

#13

Frank baked four dozen cookies for a bake sale. Each dozen cookies required three cups of chocolate chips. Write and solve an equation to find out how many cups of chocolate chips Frank bought.

#13 Answer

Frank bought 12 cups of chocolate chips.

43

x

#14

Write as an algebraic equation:

21 less than h

#14 Answer

h - 21

#15

Evaluate.

A number x less 10 when x is 23

#15 Answer

x – 10

23 – 10

13

#16

Evaluate – Order of Operations

321 (3 2 )

#16 Answer

10

#17Solve wx – y + z; when w = 15, x = 2,

y = 7, z = 2

#17 Answer

25

#18

79 = 61 + v

#18 Answer

v = 18

#19

85

x

#19 Answer

x = 40

#20

w – 8.9 = 10.3

#20 Answer

w = 19.2

#21

The sum of a number g and 43 when g is 15

#21 Answer

g + 43

15 + 43

58

#22

Find the missing value in the table

r 10 15 20 30

r - 5 5 10 15

#22 Answer

r 10 15 20 30

r - 5 5 10 15 20

#23

Write an equation, then solve.

A number multiplied by 3 is 36.

#23 Answer

3n = 36

n = 12

#24

A high school library has fiction and non-fiction books. There are 2,730 fiction books. The library has 7,680 books altogether. Write and solve an equation to find the number of non-fiction books in the high school library.

#24 Answer

2730 + n = 7680

n = 4950

There are 4,950 non-fiction books in the library

#25

Write an expression for the sequence in the table

6 7 8 9 n

2 3 4 5

#25 Answer

6 7 8 9 n

2 3 4 5 n-4