Here's the solution to the "Find the missing numbers" addition worksheet. Each problem involves finding the missing addend in a 3-number addition equation.
The general method is:
1. Add the two known numbers.
2. Subtract that sum from the total on the other side of the equals sign.
3. The result is the missing number.
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Solutions:
1) 124 = ___ + 16 + 29
→ 16 + 29 = 45
→ 124 – 45 =
79
✔ Answer:
79
2) 75 + 22 + ___ = 115
→ 75 + 22 = 97
→ 115 – 97 =
18
✔ Answer:
18
3) ___ + 13 + 22 = 113
→ 13 + 22 = 35
→ 113 – 35 =
78
✔ Answer:
78
4) 43 + 73 + ___ = 127
→ 43 + 73 = 116
→ 127 – 116 =
11
✔ Answer:
11
5) 147 = 46 + 44 + ___
→ 46 + 44 = 90
→ 147 – 90 =
57
✔ Answer:
57
6) 32 + ___ + 39 = 91
→ 32 + 39 = 71
→ 91 – 71 =
20
✔ Answer:
20
7) 27 + ___ + 14 = 101
→ 27 + 14 = 41
→ 101 – 41 =
60
✔ Answer:
60
8) 45 + ___ + 3 = 139
→ 45 + 3 = 48
→ 139 – 48 =
91
✔ Answer:
91
9) 93 = ___ + 17 + 31
→ 17 + 31 = 48
→ 93 – 48 =
45
✔ Answer:
45
10) 181 = 50 + 43 + ___
→ 50 + 43 = 93
→ 181 – 93 =
88
✔ Answer:
88
11) 126 = 41 + 44 + ___
→ 41 + 44 = 85
→ 126 – 85 =
41
✔ Answer:
41
12) ___ + 14 + 41 = 108
→ 14 + 41 = 55
→ 108 – 55 =
53
✔ Answer:
53
13) ___ + 17 + 23 = 73
→ 17 + 23 = 40
→ 73 – 40 =
33
✔ Answer:
33
14) 155 = 68 + ___ + 16
→ 68 + 16 = 84
→ 155 – 84 =
71
✔ Answer:
71
15) ___ + 37 + 77 = 145
→ 37 + 77 = 114
→ 145 – 114 =
31
✔ Answer:
31
16) 122 = 55 + 15 + ___
→ 55 + 15 = 70
→ 122 – 70 =
52
✔ Answer:
52
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Final Answer Key:
1)
79
2)
18
3)
78
4)
11
5)
57
6)
20
7)
60
8)
91
9)
45
10)
88
11)
41
12)
53
13)
33
14)
71
15)
31
16)
52
You can now fill in the blanks on your worksheet! 🎉
Parent Tip: Review the logic above to help your child master the concept of number addition worksheet.
