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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

Subtract ones

Explanation:

Subtract the ones we get 8 – 3 = 5

So, the difference of 8 and 3 is 5

8 – 3 = 5

e.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

Subtract ones

Explanation:

Subtract the ones we get 9 – 2 = 7

So, the difference of 9 and 2 is 7

9 – 2 = 7

f.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

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.

Answer:

Subtract ones Subtract tens

Explanation:

Subtract the ones we get 9 – 7 = 2

Subtract the tens we get 9 – 7 = 2

So, the difference of 99 and 77 is 22

99 – 77 = 22