Go through the Math in Focus Grade 3 Workbook Answer Key Chapter 2 Practice 2 Mental Subtraction to finish your assignments.

## Math in Focus Grade 3 Chapter 2 Practice 2 Answer Key Mental Subtraction

**Subtract mentally. First, subtract the tens. Then, subtract the ones.**

Example

Question 1.

89 – 57 = ?

89 – 50 = ___

___ – ___ = ___

So, 89 – 57 = ___

Answer:

89 – 50 = 39

39 – 7 = 32

So, 89 – 57 = 32

Question 2.

75 – 33 = ?

75 – 30 = ___

___ – ___ = ___

So, 75 – 33 = ____

Answer:

75 – 30 = 45

45 – 3 = 42

So, 75 – 33 = 42

**Subtract mentally.**

**First, subtract the tens. Then, add the extra ones.**

Example

Question 3.

92 – 35 = ?

92 – 40 = ___

___ + ___ = ___

So, 92 – 35 = ___

Answer:

92 – 40 = 52

52 + 5 = 57

So, 92 – 35 = 57

Question 4.

87 – 18 = ?

87 – 20 = ___

___ + ___ = ___

So, 87 – 18 = ___

Answer:

87 – 20 = 67

67 + 2 = 69

So, 87 – 18 = 69

Question 5.

72 – 44 = ?

72 – 50 = ___

___ + ___ = ___

So, 72 – 44 = ___

Answer:

72 – 50 = 22

22 + 6 = 28

So, 72 – 44 = 28

Question 6.

88 – 39 = ?

88 – 40 = ___

___ + ___ = ___

So, 88 – 39 = ___

Answer:

88 – 40 = 48

48 + 1 = 49

So, 88 – 39 = 49

**Subtract mentally. Use number bonds to help you.**

Question 7.

84 – 23 = ___

Answer:

84 – 23

80 – 20 = 60

60 + 4 – 3 = 61

So, 84 – 23 = = 61

Question 8.

55 – 31 = ___

Answer:

55 – 31

55 – 30 = 25

25 – 1 = 24

So, 55 – 31 = = 24

Question 9.

58 – 42 = ___

Answer:

58 – 42

60 – 40 = 20

20 -2 -2 = 16

Question 10.

79 – 65 = ___

Answer:

79 – 65

80 – 65 = 15

15 – 1 = 14

So, 79 – 65 = 14

Question 11.

92 – 34 = ___

Answer:

92 – 34

90 – 30 = 60

60 + 2 – 4 = 58

So, 92 – 34 = 58

Question 12.

75 – 47 = ___

Answer:

75 – 47

75 – 50 = 25

25 + 3 = 28

So, 75 – 47 = 28

Question 13.

61 – 26 = ___

Answer:

61 – 26

60 – 30 = 30

30 + 1 + 4 = 35

So, 61 – 26 = 35

Question 14.

82 – 33 = ___

Answer:

82 – 33

80 – 30 = 50

50 + 2 – 3 = 49

So, 82 – 33 = 49

Question 15.

93 – 48 = ____

Answer:

93 – 48

90 – 50 = 40

40 + 3 + 2 = 45

So, 93 – 48 = 45

Question 16.

81 – 45 = ___

Answer:

81 – 45

80 – 45 = 35

35 + 1 = 36

Question 17.

Complete the puzzle. Use mental math.

Answer: