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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 135 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.45 + ? = 100
  2. 2.36 + ? = 100
  3. 3.27 + ? = 100
  4. 4.1 + ? = 10
  5. 5.4 + ? = 10
  6. 6.81 + ? = 100
  7. 7.9 + ? = 10
  8. 8.26 + ? = 100
  9. 9.71 + ? = 100
  10. 10.21 + ? = 100
  11. 11.56 + ? = 100
  12. 12.54 + ? = 100
  13. 13.2 + ? = 10
  14. 14.6 + ? = 10
  15. 15.79 + ? = 100
  16. 16.15 + ? = 100
  17. 17.8 + ? = 10
  18. 18.28 + ? = 100
  19. 19.44 + ? = 100
  20. 20.52 + ? = 100
  21. 21.69 + ? = 100
  22. 22.3 + ? = 10
  23. 23.11 + ? = 100
  24. 24.58 + ? = 100
  25. 25.72 + ? = 100
  26. 26.83 + ? = 100
  27. 27.59 + ? = 100
  28. 28.32 + ? = 100
  29. 29.62 + ? = 100
  30. 30.47 + ? = 100
  31. 31.19 + ? = 100
  32. 32.35 + ? = 100
  33. 33.13 + ? = 100
  34. 34.5 + ? = 10
  35. 35.18 + ? = 100
  36. 36.64 + ? = 100
  37. 37.88 + ? = 100
  38. 38.87 + ? = 100
  39. 39.34 + ? = 100
  40. 40.7 + ? = 10

Answer key

  1. 55
  2. 64
  3. 73
  4. 9
  5. 6
  6. 19
  7. 1
  8. 74
  9. 29
  10. 79
  11. 44
  12. 46
  13. 8
  14. 4
  15. 21
  16. 85
  17. 2
  18. 72
  19. 56
  20. 48
  21. 31
  22. 7
  23. 89
  24. 42
  25. 28
  26. 17
  27. 41
  28. 68
  29. 38
  30. 53
  31. 81
  32. 65
  33. 87
  34. 5
  35. 82
  36. 36
  37. 12
  38. 13
  39. 66
  40. 3

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