All the solutions provided in **McGraw Hill Math Grade 5 Answer Key PDF Chapter 2 Lesson 2 Relating Addition and Subtraction** are as per the latest syllabus guidelines.

## McGraw-Hill Math Grade 5 Answer Key Chapter 2 Lesson 2 Relating Addition and Subtraction

**Add or subtract**

**Use inverse operations to solve.
**Question 1.

17 + 48 = 65

65 – 48 =

__17__

Answer:

17 + 48 = 65.

65 – 48 = 17.

Explanation:

17 + 48 = 65.

A + B = C.

=> C – B = A.

=>65 – 48 = 17.

Question 2.

39 – 18 = 21

21 + 18 = ____

Answer:

39 – 18 = 21.

21 + 18 = 39.

Explanation:

39 – 18 = 21.

A + B = C.

=> C – B = A.

=> 21 + 18 = 39.

Question 3.

64 + 83 = ___

147 – 83 = ____

Answer:

64 + 83 = 147.

147 – 83 = 64.

Explanation:

64 + 83 = 147.

A + B = C.

=> C – B = A.

=>147 – 83 = 64.

Question 4.

56 – 27 = 29

29 + 27 = ____

Answer:

56 – 27 = 29.

29 + 27 = 56.

Explanation:

56 – 27 = 29.

A + B = C.

=> C – B = A.

=> 29 + 27 = 56.

Question 5.

79 + 40 = 119

119 – 40 = ___

Answer:

79 + 40 = 119.

119 – 40 = 79.

Explanation:

79 + 40 = 119.

A + B = C.

=> C – B = A.

=> 119 – 40 = 79.

Question 6.

82 – 58 = ____

24 + 58 = ____

Answer:

82 – 58 = 24.

24 + 58 = 82.

Explanation:

82 – 58 = 24.

A + B = C.

=> C – B = A.

=> 24 + 58 = 82.

Question 17.

71 + 57 = 128

128 – 57 = ____

Answer:

71 + 57 = 128.

128 – 57 = 71.

Explanation:

71 + 57 = 128.

A + B = C.

=> C – B = A.

=> 128 – 57 = 71.

Question 18.

79 – 41 = 38

38 + 41 = ____

Answer:

79 – 41 = 38.

38 + 41 = 79.

Explanation:

79 – 41 = 38.

A + B = C.

=> C – B = A.

=> 38 + 41 = 79.

Question 9.

78 + 56 = ____

134 – 56 = ____

Answer:

78 + 56 = 134.

134 – 56 = 78.

Explanation:

78 + 56 = 134.

A + B = C.

=> C – B = A.

=> 134 – 56 = 78.

Question 10.

Teddy wants to know the value of x in 49 + x = 56. He knows the difference of 56 and 49 is 7. How can he find the value of x? Explain.

Answer:

The value of x in equation 49 + x = 56 can be solved by using subtraction.

=> x = 7.

Explanation:

value of x in 49 + x = 56:

49 + x =56

=> x = 56 – 49

=> x = 7.

Question 11.

Teresa wants to find the difference of 136 and 117. She knows the sum of 117 and 19 is 136. How can she find the difference? Explain.

Answer:

She can find difference by using cumulative property of subtraction.

139 – 117 = 19.

Explanation:

Difference of 136 and 117:

136 – 117 = 19.

Sum of 117 and 19:

117 + 19 = 136.

Cumulative property of subtraction:

=> 139 – 117 = 19.