# Spectrum Math Grade 4 Chapter 1 Lesson 2 Answer Key Subtracting 1- and 2-Digit Numbers

This handy Spectrum Math Grade 4 Answer Key Chapter 1 Lesson 1.2 Subtracting 1- and 2-Digit Numbers provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 1 Lesson 1.2 Subtracting 1- and 2-Digit Numbers Answers Key

If 9 – 3 = 6, then 90 – 30 = 60

Subtract.

Question 1.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 3 – 2 = 1
Subtract the tens we get 3 – 1 = 2
So, the difference of 33 and 12  is  21
33 – 12 = 21

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 3 – 0 = 3
Subtract the tens we get 4 – 2 = 2
So, the difference of 43 and 20 is  23
43 – 20 = 23

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 1 – 0 = 1
Subtract the tens we get 9 – 3  = 6
So, the difference of 91 and 30 is  61
91 – 30 = 61

d.

Subtract ones

Explanation:
Subtract the ones we get 8 – 3 = 5
So, the difference of 8 and 3 is  5
8 – 3 = 5

e.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 0 – 0 = 0
Subtract the tens we get 9 – 2  = 7
So, the difference of 90 and 20 is  70
90 – 20 = 70

f.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 2 – 1 = 1
Subtract the tens we get 7 – 1  = 6
So, the difference of 72 and 11 is  61
72 – 11 = 61

Question 2.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 8 – 4 = 4
Subtract the tens we get 8 – 2  = 6
So, the difference of 88 and 24 is  64
88 – 24 = 64

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 9 – 8 = 1
Subtract the tens we get 5 – 3  = 2
So, the difference of 59 and 38 is  21
59 – 38 = 21

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 3 – 1 = 2
Subtract the tens we get 4 – 3  = 1
So, the difference of 43 and 31 is  12
43 – 31 = 12

d.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 0 – 0 = 0
Subtract the tens we get 5 – 4  = 1
So, the difference of 50 and 40 is  10
50 – 40 = 10

e.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 8 – 7 = 1
Subtract the tens we get 4 – 1  = 3
So, the difference of 48 and 17 is  31
48 – 17 = 31

f.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 2 – 2 = 0
Subtract the tens we get 7 – 6  = 1
So, the difference of 72 and 62 is  10
72 – 62 = 10

Question 3.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 5 – 5 = 0
Subtract the tens we get 2 – 1  = 1
So, the difference of 25 and 15 is  10
25 – 15 = 10

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 4 – 4 = 0
Subtract the tens we get 9 – 0  = 9
So, the difference of 94 and 4 is  90
94 – 4 = 90

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 0 – 0 = 0
Subtract the tens we get 5 – 3  = 2
So, the difference of 50 and 30 is  20
50 – 30 = 20

d.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 5 – 3 = 2
Subtract the tens we get 3 – 0  = 3
So, the difference of 35 and 3 is  32
35 – 3 = 32

e.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 7 – 0 = 7
Subtract the tens we get 2 – 1  = 1
So, the difference of 27 and 10 is  17
27 – 10 = 17

f.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 3 – 2 = 1
Subtract the tens we get 1 – 1  = 0
So, the difference of 13 and 12 is  01
13 – 12 = 1

Question 4.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 3 – 0 = 3
Subtract the tens we get 5 – 4  = 1
So, the difference of 53 and 40 is  13
53 – 40 = 13

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 4 – 3 = 1
Subtract the tens we get 1 – 0  = 1
So, the difference of 14 and 3 is  11
14 – 3 = 11

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 8 – 0 = 8
Subtract the tens we get 1 – 1  = 0
So, the difference of 18 and 10 is  8
18 – 10 = 8

d.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 5 – 2 = 3
Subtract the tens we get 5 – 4  = 1
So, the difference of 55 and 42 is 13
55 – 42 = 13

e.

Subtract ones

Explanation:
Subtract the ones we get 9 – 2 = 7
So, the difference of 9 and 2 is 7
9 – 2 = 7

f.

Subtract ones

Explanation:
Subtract the ones we get 10 – 8 = 2
So, the difference of 10 and 8 is 2
10 – 8 = 2

Question 5.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 9 – 8 = 1
Subtract the tens we get 4 – 1  = 3
So, the difference of 49 and 18 is 31
49 – 18 =31

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 4 – 3 = 1
Subtract the tens we get 7 – 0  = 7
So, the difference of 74 and 3 is 71
74 – 3 = 71

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 9 – 7 = 2
Subtract the tens we get 5 – 2  = 3
So, the difference of 59 and 27  is 32
59 – 27 = 32

d.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 8 – 7 = 1
Subtract the tens we get 6 – 0  = 6
So, the difference of 68 and 7 is 61
68 – 7 =61

e.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 3 – 2 = 1
Subtract the tens we get 9 – 2  = 7
So, the difference of 93 and 22  is 71
93 – 22 = 71

f.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 8 – 7 = 1
Subtract the tens we get 3 – 3  = 0
So, the difference of 38 and 37 is 1
38 – 37 = 01

Question 6.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 9 – 5 = 4
Subtract the tens we get 7 – 3  = 4
So, the difference of 79 and 35 is 44
79 – 35 = 44

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 1 – 1 = 0
Subtract the tens we get 2 – 1  = 1
So, the difference of 21 and 11 is 10
21 – 11 = 10

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 6 – 2 = 4
Subtract the tens we get 4 – 4  = 0
So, the difference of 46 and 42 is 4
46 – 42 = 4

d.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 8 – 4 = 4
Subtract the tens we get 7 – 6  = 1
So, the difference of 78 and 64 is 14
78 – 64 =14

e.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 5 – 4 = 1
Subtract the tens we get 1 – 0  = 1
So, the difference of 15 and 4 is 11
15 – 4 = 11

f.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 7 – 5 = 2
Subtract the tens we get 8 – 3  = 5
So, the difference of 87 and 35  is 52
87 – 35 = 52

Question 7.
a.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 5 – 3 = 2
Subtract the tens we get 2 – 1  = 1
So, the difference of 25 and 13 is 12
25 -13 =12

b.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 1 – 0 = 1
Subtract the tens we get 7 – 2  = 5
So, the difference of 71 and 20 is 51
71 – 20 = 51

c.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 6 – 3 = 3
Subtract the tens we get 4 – 2  = 2
So, the difference of 46 and 23 is 23
46 – 23 = 23

d.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 6 – 1 = 5
Subtract the tens we get 5 – 4  = 1
So, the difference of 56  and 41 is 15
56 – 41 =15

e.

Subtract ones   Subtract tens

Explanation:
Subtract the ones we get 5 – 3 = 2
Subtract the tens we get 8 – 6  = 2
So, the difference of 85 and 63 is 22
85 – 63 = 22

f.