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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 520 · 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. 1.44 + ? = 100
  2. 2.19 + ? = 100
  3. 3.4 + ? = 10
  4. 4.5 + ? = 10
  5. 5.45 + ? = 100
  6. 6.63 + ? = 100
  7. 7.34 + ? = 100
  8. 8.7 + ? = 10
  9. 9.9 + ? = 10
  10. 10.8 + ? = 10
  11. 11.86 + ? = 100
  12. 12.81 + ? = 100
  13. 13.35 + ? = 100
  14. 14.6 + ? = 10
  15. 15.68 + ? = 100
  16. 16.11 + ? = 100
  17. 17.43 + ? = 100
  18. 18.71 + ? = 100
  19. 19.16 + ? = 100
  20. 20.37 + ? = 100
  21. 21.58 + ? = 100
  22. 22.24 + ? = 100
  23. 23.54 + ? = 100
  24. 24.38 + ? = 100
  25. 25.83 + ? = 100
  26. 26.1 + ? = 10
  27. 27.21 + ? = 100
  28. 28.30 + ? = 100
  29. 29.13 + ? = 100
  30. 30.17 + ? = 100
  31. 31.39 + ? = 100
  32. 32.74 + ? = 100
  33. 33.57 + ? = 100
  34. 34.89 + ? = 100
  35. 35.82 + ? = 100
  36. 36.40 + ? = 100
  37. 37.2 + ? = 10
  38. 38.23 + ? = 100
  39. 39.26 + ? = 100
  40. 40.29 + ? = 100

Answer key

  1. 56
  2. 81
  3. 6
  4. 5
  5. 55
  6. 37
  7. 66
  8. 3
  9. 1
  10. 2
  11. 14
  12. 19
  13. 65
  14. 4
  15. 32
  16. 89
  17. 57
  18. 29
  19. 84
  20. 63
  21. 42
  22. 76
  23. 46
  24. 62
  25. 17
  26. 9
  27. 79
  28. 70
  29. 87
  30. 83
  31. 61
  32. 26
  33. 43
  34. 11
  35. 18
  36. 60
  37. 8
  38. 77
  39. 74
  40. 71

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