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:
