Let's solve each problem on
"Number Bonds to 100 Sheet 7" step by step. The goal is to find the missing numbers in each equation so that the total equals 100 or complete the subtraction/addition accordingly.
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🔢 Solving Each Problem:
We'll go through each one and explain how to get the answer.
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1) 55 + ___ = 100
→ 100 - 55 = 45
✔ Answer: 45
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2) ___ + 20 = 100
→ 100 - 20 = 80
✔ Answer: 80
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3) ___ + 90 = 100
→ 100 - 90 = 10
✔ Answer: 10
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4) 62 + ___ = 100
→ 100 - 62 = 38
✔ Answer: 38
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5) 14 + ___ = 100
→ 100 - 14 = 86
✔ Answer: 86
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6) 51 + ___ = 100
→ 100 - 51 = 49
✔ Answer: 49
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7) ___ + 37 = 100
→ 100 - 37 = 63
✔ Answer: 63
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8) 100 - 28 = ___
→ 100 - 28 = 72
✔ Answer: 72
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9) 100 - 64 = ___
→ 100 - 64 = 36
✔ Answer: 36
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10) 100 = 74 + ___
→ 100 - 74 = 26
✔ Answer: 26
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11) 100 = ___ + 15
→ 100 - 15 = 85
✔ Answer: 85
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12) 100 - 94 = ___
→ 100 - 94 = 6
✔ Answer: 6
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13) 100 - ___ = 72
→ 100 - 72 = 28
✔ Answer: 28
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14) 100 = 35 + ___
→ 100 - 35 = 65
✔ Answer: 65
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15) 40 = 100 - ___
→ 100 - 40 = 60
✔ Answer: 60
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16) 72 + ___ = 100
→ 100 - 72 = 28
✔ Answer: 28
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17) ___ + 16 = 100
→ 100 - 16 = 84
✔ Answer: 84
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18) 27 = 100 - ___
→ 100 - 27 = 73
✔ Answer: 73
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19) 100 - ___ = 69
→ 100 - 69 = 31
✔ Answer: 31
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20) 43 + ___ = 100
→ 100 - 43 = 57
✔ Answer: 57
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21) 100 = 87 + ___
→ 100 - 87 = 13
✔ Answer: 13
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22) 100 - ___ = 74
→ 100 - 74 = 26
✔ Answer: 26
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23) 100 - 13 = ___
→ 100 - 13 = 87
✔ Answer: 87
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24) 82 + ___ = 100
→ 100 - 82 = 18
✔ Answer: 18
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25) 100 = ___ + 44
→ 100 - 44 = 56
✔ Answer: 56
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26) 100 - 11 = ___
→ 100 - 11 = 89
✔ Answer: 89
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27) 38 = 100 - ___
→ 100 - 38 = 62
✔ Answer: 62
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28) 100 - ___ = 77
→ 100 - 77 = 23
✔ Answer: 23
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29) 29 + ___ = 100
→ 100 - 29 = 71
✔ Answer: 71
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30) 100 = 12 + ___
→ 100 - 12 = 88
✔ Answer: 88
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31) 52 = 100 - ___
→ 100 - 52 = 48
✔ Answer: 48
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32) 100 - ___ = 100
→ 100 - 100 = 0
✔ Answer: 0
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33) 8 + ___ = 100
→ 100 - 8 = 92
✔ Answer: 92
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34) ___ - 34 = 66
→ Add 34 to both sides: 66 + 34 = 100
✔ Answer: 100
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35) 87 + 13 = ___
→ 87 + 13 = 100
✔ Answer: 100
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36) 46 = 100 - ___
→ 100 - 46 = 54
✔ Answer: 54
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37) 100 - 22 = ___
→ 100 - 22 = 78
✔ Answer: 78
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38) 9 = 100 - ___
→ 100 - 9 = 91
✔ Answer: 91
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39) 100 = 81 + ___
→ 100 - 81 = 19
✔ Answer: 19
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40) 92 = 100 - ___
→ 100 - 92 = 8
✔ Answer: 8
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✔ Final Answers:
| # | Answer |
|---|--------|
| 1 | 45 |
| 2 | 80 |
| 3 | 10 |
| 4 | 38 |
| 5 | 86 |
| 6 | 49 |
| 7 | 63 |
| 8 | 72 |
| 9 | 36 |
|10 | 26 |
|11 | 85 |
|12 | 6 |
|13 | 28 |
|14 | 65 |
|15 | 60 |
|16 | 28 |
|17 | 84 |
|18 | 73 |
|19 | 31 |
|20 | 57 |
|21 | 13 |
|22 | 26 |
|23 | 87 |
|24 | 18 |
|25 | 56 |
|26 | 89 |
|27 | 62 |
|28 | 23 |
|29 | 71 |
|30 | 88 |
|31 | 48 |
|32 | 0 |
|33 | 92 |
|34 | 100 |
|35 | 100 |
|36 | 54 |
|37 | 78 |
|38 | 91 |
|39 | 19 |
|40 | 8 |
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📌 Summary:
All problems are based on
number bonds to 100, meaning two numbers that add up to 100. The strategy used is:
- If it's
addition: subtract the known number from 100.
- If it's
subtraction: either subtract or rearrange to find the missing number.
This reinforces understanding of
complements to 100, a key skill in mental math and arithmetic.
Let me know if you'd like this as a printable PDF or need help with similar sheets!
Parent Tip: Review the logic above to help your child master the concept of compatible numbers worksheet 3rd grade.
