This handy **Spectrum Math Grade 4 Answer Key Chapter 1 Pretest** provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 1 Pretest Answers Key

**Add or subtract.**

Question 1.

a.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 5 + 3 = 8

Adding the tens we get 3 + 0 = 3

So, the sum of both addends 35 and 3 is 38

35 + 3 = 38

b.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 5 + 3 = 8

Adding the tens we get 2 + 1 = 3

So, the sum of both addends 25 and 13 is 38

25 + 13 = 38

c.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 5 + 4 = 9

Adding the tens we get 7 + 2 = 9

So, the sum of both addends 75 and 24 is 99

75 + 24 = 99

d.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 3 + 2 = 5

Adding the tens we get 1+ 1 = 2

So, the sum of both addends 13 and 12 is 25

13 + 12 = 25

e.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 2 + 7 = 9

Adding the tens we get 4+ 0 = 4

So, the sum of both addends 42 and 7 is 49

42 + 7 = 49

f.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 4 + 3 = 7

Adding the tens we get 5+ 3 = 8

So, the sum of both addends 54 and 33 is 87

54 + 33 = 87

Question 2.

a.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 3 + 4 = 7

Adding the tens we get 4+ 2 = 6

So, the sum of both addends 43 and 24 is 67

43 + 24 = 67

b.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 4 + 5 = 9

Adding the tens we get 5+ 0 = 5

So, the sum of both addends 54 and 5 is 59

54 + 5 = 59

c.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 3 + 1 = 4

Adding the tens we get 6+ 3 = 9

So, the sum of both addends 63 and 31 is 94

63 + 31 = 94

d.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 2 + 6 = 8

Adding the tens we get 8+ 1 = 9

So, the sum of both addends 82 and 16 is 98

82 + 16 = 98

e.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 2 + 3 = 5

Adding the tens we get 3+ 2 = 5

So, the sum of both addends 32 and 23 is 55

32 + 23 = 55

f.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 4 + 5 = 9

Adding the tens we get 7+ 1 = 8

So, the sum of both addends 74 and 15 is 89

74 + 15 = 89

Question 3.

a.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 0 + 3 = 3

Adding the tens we get 5+ 3 = 8

So, the sum of both addends 50 and 33 is 83

50 + 33 = 83

b.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 5 + 2 = 7

Adding the tens we get 9+ 0 = 9

So, the sum of both addends 95 and 2 is 97

95 + 2 = 97

c.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 2 + 5 = 7

Adding the tens we get 3+ 2 = 5

So, the sum of both addends 32 and 25 is 57

32 + 25 = 57

d.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 3 + 5 = 8

Adding the tens we get 7+ 2 = 9

So, the sum of both addends 73 and 25 is 98

73 + 25 = 98

e.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 6 + 3 = 9

Adding the tens we get 5+ 1 = 6

So, the sum of both addends 56 and 13 is 69

56 + 13 = 69

f.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 7 + 2 = 9

Adding the tens we get 4+ 3 = 7

So, the sum of both addends 47 and 32 is 79

47 + 32 = 79

Question 4.

a.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 2 + 7 = 9

Adding the tens we get 1+ 0 = 1

So, the sum of both addends 12 and 7 is 19

12 + 7 = 19

b.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 6 + 2 = 8

Adding the tens we get 3+ 1 = 4

So, the sum of both addends 36 and 12 is 48

36 + 12 = 48

c.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 5 + 3 = 8

Adding the tens we get 5+ 2 = 7

So, the sum of both addends 55 and 23 is 78

55 + 23 = 78

d.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 0 + 9 = 9

Adding the tens we get 7+ 1 = 8

So, the sum of both addends 70 and 19 is 89

70 + 19 = 89

e.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 2 + 4 = 6

Adding the tens we get 9+ 0 = 9

So, the sum of both addends 92 and 4 is 96

92 + 4 = 96

f.

Answer:

Add the ones Add the tens

Explanation:

Adding the ones we get 4 + 3 = 7

Adding the tens we get 5+ 2 = 7

So, the sum of both addends 54 and 23 is 77

54 + 23 = 77

Question 5.

a.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 5 – 4 = 1

Subtract the tens we get 4 – 0 = 4

So, the difference of 45 and 4 is 41

45 – 4 = 41

b.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 5 – 3 = 2

Subtract the tens we get 7 – 2 = 5

So, the difference of 75 and 23 is 52

75 – 23 = 52

c.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 6 – 4 = 2

Subtract the tens we get 6 – 1 = 5

So, the difference of 66 and 14 is 52

66 – 14 = 52

d.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 5 – 1 = 4

Subtract the tens we get 9 – 3 = 6

So, the difference of 95 and 31 is 64

95 – 31 = 64

e.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 4 – 2 = 2

Subtract the tens we get 8 – 2 = 6

So, the difference of 84 and 22 is 62

84 – 22 = 62

f.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 5 – 2 = 3

Subtract the tens we get 2 – 1 = 1

So, the difference of 25 and 12 is 13

25 – 12 = 13

Question 6.

a.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 7 = 2

Subtract the tens we get 4 – 2 = 2

So, the difference of 49 and 27 is 22

49 – 27 = 22

b.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 7 – 6 = 1

Subtract the tens we get 5 – 4 = 1

So, the difference of 57 and 46 is 11

57 – 46 = 11

c.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 8 = 1

Subtract the tens we get 3 – 1 = 2

So, the difference of 39 and 18 is 21

39 – 18 = 21

d.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 7 = 2

Subtract the tens we get 7 – 2 = 5

So, the difference of 79 and 27 is 52

79 – 27 = 52

e.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 7 – 6 = 1

Subtract the tens we get 2 – 0 = 2

So, the difference of 27 and 6 is 21

27 – 6 = 21

f.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 8 – 6 = 2

Subtract the tens we get 8 – 5 = 3

So, the difference of 88 and 56 is 32

88 – 56 = 32

Question 7.

a.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 5 – 5 = 0

Subtract the tens we get 6 – 5 = 1

So, the difference of 65 and 55 is 10

65 – 55 = 10

b.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 8 – 3 = 5

Subtract the tens we get 7 – 3 = 4

So, the difference of 78 and 33 is 45

78 – 33 = 45

c.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 4 – 2 = 2

Subtract the tens we get 5 – 4 = 1

So, the difference of 54 and 42 is 12

54 – 42 = 12

d.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 7 – 6 = 1

Subtract the tens we get 9 – 2 = 7

So, the difference of 97 and 26 is 71

97 – 26 = 71

e.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 5 = 4

Subtract the tens we get 2 – 1 = 1

So, the difference of 29 and 15 is 14

29 – 15 = 14

f.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 8 = 1

Subtract the tens we get 5 – 4 = 1

So, the difference of 59 and 48 is 11

59 – 48 = 11

Question 8.

a.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 4 – 3 = 1

Subtract the tens we get 5 – 2 = 3

So, the difference of 54 and 23 is 31

54 – 23 = 31

b.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 8 = 1

Subtract the tens we get 2 – 1 = 1

So, the difference of 29 and 18 is 11

29 – 18 = 11

c.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 7 – 7 = 0

Subtract the tens we get 4 – 3 = 1

So, the difference of 47 and 37 is 10

47 – 37 = 10

d.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 6 = 3

Subtract the tens we get 9 – 6 = 3

So, the difference of 99 and 66 is 33

99 – 66 = 33

e.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 7 = 2

Subtract the tens we get 8 – 2 = 6

So, the difference of 89 and 27 is 62

89 – 27 = 62

f.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 6 – 5 = 1

Subtract the tens we get 3 – 1 = 2

So, the difference of 36 and 15 is 21

36 – 15 = 21

**Solve each problem.**

Question 9.

Mr. Dimas has 15 new students in his fourth-grade class. He already has 21 students in the class. How many students are in Mr. Dimas’s class?

There are ___________ students in his class.

Answer:

Question 10.

There are 35 pages in Kendrick science book. Last night, Kendrick read 14 pages. How many more pages does Kendrick have left to read?

There are ____ pages left to read.

Answer:

21

Explanation:

There are 35 pages in Kendrick science book

Kendrick read 14 pages

So, there are more 21 pages left to read.

Total pages – read pages = left pages

35 – 14 = 21

Question 11.

Kono’s father gave him 75 apples so he could pass them out to his friends. If Kono gave 43 away, how many apples does he have left?

There are ____ apples left.

Answer:

32

Explanation:

Kono’s father gave him 75 apples so he could pass them out to his friends.

If Kono gave 43 away, then

There will be 32 apples left.

75 – 43 = 32

Question 12.

Monica and Tania want to throw a surprise party for Rosa. They plan to send out 45 invitations. If Tania writes 24, how many invitations does Monica need to write?

Monica needs to write ___________ invitations.

Answer:

21

Explanation:

Monica and Tania want to throw a surprise party for Rosa

They plan to send out 45 invitations

If Tania writes 24, then

Monica needs to write 21 invitations.

24 + 21 = 45

Question 13.

Seki’s soccer team is in the State Cup Tournament. There were 23 goals made in the entire tournament. Seki’s team made 12 of them. How many goals were made by the other teams?

The other teams scored ____ goals.

Answer:

11

Explanation:

There were 23 goals made in the entire tournament

Seki’s team made 12 of them

The other teams scored 11 goals.

12 + 11 = 23