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

Question 1.
a.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.
21
Explanation:
There are 35 pages in Kendrick science book
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.
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.
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.