This handy **Spectrum Math Grade 4 Answer Key Chapter 1 Lesson 1.7 Thinking Subtraction for Addition** provides detailed answers for the workbook questions.

## Spectrum Math Grade 4 Chapter 1 Lesson 1.7 Thinking Subtraction for Addition Answers Key

**Add. Then, check you answer.**

Question 1.

a.

Answer:

Explanation:

By adding 47 to 32 we will get 79

32 + 47 = 79

By subtracting 47 from 79 we will get 32

79 – 47 = 32

Both the numbers are same.

b.

Answer:

Explanation:

By adding 19 to 63 we will get 82

63 + 19 = 82

By subtracting 19 from 82 we will get 63

82 – 19 = 63

Both the numbers are same.

c.

Answer:

Explanation:

By adding 24 to 38 we will get 62

38 + 24 = 62

By subtracting 24 from 62 we will get 38

62 – 24 = 38

Both the numbers are same.

d.

Answer:

Explanation:

By adding 47 to 52 we will get 99

52 + 47 = 99

By subtracting 47 from 99 we will get 52

99 – 47 = 52

Both the numbers are same.

e.

Answer:

Explanation:

By adding 15 to 28 we will get 43

28 + 15 = 43

By subtracting 15 from 43 we will get 28

43 – 15 = 28

Both the numbers are same.

f.

Answer:

Explanation:

By adding 15 to 75 we will get 90

75 + 15 = 90

By subtracting 15 from 90 we will get 75

90 – 15 = 75

Both the numbers are same.

Question 2.

a.

Answer:

Explanation:

By adding 27 to 48 we will get 75

48 + 27 =75

By subtracting 27 from 75 we will get 48

75 – 27 = 48

Both the numbers are same.

b.

Answer:

Explanation:

By adding 10 to 82 we will get 92

82 + 10 = 92

By subtracting 10 from 92 we will get 82

92 – 10 = 82

Both the numbers are same.

c.

Answer:

Explanation:

By adding 38 to 56 we will get 94

56 + 38 = 94

By subtracting 38 from 94 we will get 56

94 – 38 = 56

Both the numbers are same.

d.

Answer:

Explanation:

By adding 27 to 44 we will get 71

44 + 27 = 71

By subtracting 27 from 71 we will get 44

71 – 27 = 44

Both the numbers are same.

e.

Answer:

Explanation:

By adding 27 to 28 we will get 55

28 + 27 = 55

By subtracting 27 from 55 we will get 28

55 – 27 = 28

Both the numbers are same.

f.

Answer:

Explanation:

By adding 32 to 39 we will get 71

39 + 32 = 71

By subtracting 32 from 71 we will get 39

71 – 32 = 39

Both the numbers are same.

Question 3.

a.

Answer:

Explanation:

By adding 59 to 31 we will get 90

31 + 59 = 90

By subtracting 59 from 90 we will get 31

90 – 59 = 31

Both the numbers are same.

b.

Answer:

Explanation:

By adding 18 to 43 we will get 61

43 + 18 = 61

By subtracting 18 from 61 we will get 43

61 – 18 = 43

Both the numbers are same.

c.

Answer:

Explanation:

By adding 29 to 61 we will get 90

61 + 29 = 90

By subtracting 29 from 90 we will get 61

90 – 29 = 61

Both the numbers are same.

d.

Answer:

Explanation:

By adding 17 to 125 we will get 142

125 + 17 = 142

By subtracting 17 from 142 we will get 125

142 – 17 = 125

Both the numbers are same.

e.

Answer:

Explanation:

By adding 38 to 155 we will get 193

155 + 38 = 193

By subtracting 38 from 193 we will get 155

193 – 38 = 155

Both the numbers are same.

f.

Answer:

Explanation:

By adding 69 to 205 we will get 274

205 + 69 = 274

By subtracting 69 from 274 we will get 205

274 – 69 = 205

Both the numbers are same.

Question 4.

a.

Answer:

Explanation:

By adding 14 to 199 we will get 213

199 + 14 =213

By subtracting 14 from 213 we will get 199

213 – 14 =199

Both the numbers are same.

b.

Answer:

Explanation:

By adding 33 to 128 we will get 161

128 + 33 = 161

By subtracting 33 from 161 we will get 128

161 – 33 = 128

Both the numbers are same.

c.

Answer:

Explanation:

By adding 50 to 125 we will get 175

125 + 50 = 175

By subtracting 50 from 175 we will get 125

175 – 50 = 125

Both the numbers are same.

d.

Answer:

Explanation:

By adding 32 to 109 we will get 141

109 + 32 = 141

By subtracting 32 from 141 we will get 109

141 – 32 = 109

Both the numbers are same.

e.

Answer:

Explanation:

By adding 27 to 155 we will get 182

155 + 27 = 182

By subtracting 27 from 182 we will get 155

182 – 27 = 155

Both the numbers are same.

f.

Answer:

Explanation:

By adding 29 to 137 we will get 166

137 + 29 = 166

By subtracting 29 from 166 we will get 137

166 – 29 = 137

Both the numbers are same.