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Grade 3 Number Bonds Worksheets

Pairs that make 10, 20 or 100 — the recall every other sum is built on.

Every sheet below is generated fresh with a matching answer key. Pick one of the three levels, preview it, and print or download the PDF — no account, no watermark. For the other grade 3 mental maths skills, see all mental maths worksheets.

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Mental Maths · Grade 3

Grade
Topic
SkillEach skill is a different kind of question, with its own levels.
Level
Questions
30

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Grade 3 · 2 pages · A4

Mental Maths Practice

Grade 3 • Number Bonds • Find the part taken away
Name:Date:

Write how much was taken away. No calculator.

  1. 1) 115 − ___ = 29
  2. 2) 155 − ___ = 94
  3. 3) 199 − ___ = 40
  1. 4) 105 − ___ = 17
  2. 5) 133 − ___ = 77
  3. 6) 192 − ___ = 92
  1. 7) 134 − ___ = 54
  2. 8) 162 − ___ = 95
  3. 9) 137 − ___ = 106
  1. 10) 125 − ___ = 26
  2. 11) 198 − ___ = 169
  3. 12) 127 − ___ = 63
  1. 13) 141 − ___ = 65
  2. 14) 179 − ___ = 15
  3. 15) 190 − ___ = 87
  1. 16) 104 − ___ = 50
  2. 17) 174 − ___ = 109
  3. 18) 189 − ___ = 9
  1. 19) 161 − ___ = 30
  2. 20) 177 − ___ = 168
  3. 21) 167 − ___ = 77
  1. 22) 106 − ___ = 31
  2. 23) 152 − ___ = 16
  3. 24) 125 − ___ = 6
  1. 25) 112 − ___ = 13
  2. 26) 151 − ___ = 123
  3. 27) 109 − ___ = 32
  1. 28) 121 − ___ = 113
  2. 29) 167 − ___ = 152
  3. 30) 123 − ___ = 43
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Page 1 of 2

Answer Key

  1. 1. 86
  2. 2. 61
  3. 3. 159
  4. 4. 88
  1. 5. 56
  2. 6. 100
  3. 7. 80
  4. 8. 67
  1. 9. 31
  2. 10. 99
  3. 11. 29
  4. 12. 64
  1. 13. 76
  2. 14. 164
  3. 15. 103
  4. 16. 54
  1. 17. 65
  2. 18. 180
  3. 19. 131
  4. 20. 9
  1. 21. 90
  2. 22. 75
  3. 23. 136
  4. 24. 119
  1. 25. 99
  2. 26. 28
  3. 27. 77
  4. 28. 8
  1. 29. 15
  2. 30. 80
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Page 2 of 2

What each level generates

Grade 3 number bonds — the exact skill behind each difficulty setting, straight from the generator.

  1. Level 1Complete the pair
  2. Level 2Find the part taken away
  3. Level 3Three parts, one missing

Grade levels follow the progression common to most English-language curricula — not one specific national curriculum. Every level shows exactly what it generates, so you can check the fit with your own program. See the full scope & sequence →

More Grade 3 mental maths skills

Each one generates a different kind of question, with its own three levels and answer key.

Frequently asked questions

▸What is mental maths for Grade 3?

Working out addition, subtraction and multiplication in the head. Each skill has a sheet of its own, and the Mixed Chains sheet rotates the three operations so a child practises choosing a strategy, not just repeating one.

▸Should my child know all the times tables by Grade 3?

Most Grade 3 programmes aim for the tables up to 10 by the end of the year, with 11 and 12 following. Times Table Facts keeps to the tables up to 10 at every Grade 3 level — straight recall, then the missing factor, then three factors — and the Grade 4 sheets extend to 12.

▸Why practise mixed operations as well as one skill at a time?

Because switching is the skill that transfers. A single-operation page lets a child answer on autopilot; the Mixed Chains sheet forces them to read the symbol and pick a method, which is what any real problem will demand of them. Use both — one skill at a time to build the facts, mixed chains to prove they hold.

▸What does the Mixed Chains sheet generate?

Chains that mix operations: 54 + 32 − 75 at the first level, 7 × 6 + 24 at the second, and four numbers in a row at the third. The multiplication always comes first so the answer is never ambiguous, and every result stays a positive whole number.