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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 174 · 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. 1.34 + ? = 100
  2. 2.79 + ? = 100
  3. 3.6 + ? = 10
  4. 4.2 + ? = 10
  5. 5.1 + ? = 10
  6. 6.23 + ? = 100
  7. 7.62 + ? = 100
  8. 8.41 + ? = 100
  9. 9.46 + ? = 100
  10. 10.48 + ? = 100
  11. 11.83 + ? = 100
  12. 12.47 + ? = 100
  13. 13.89 + ? = 100
  14. 14.9 + ? = 10
  15. 15.53 + ? = 100
  16. 16.54 + ? = 100
  17. 17.5 + ? = 10
  18. 18.3 + ? = 10
  19. 19.58 + ? = 100
  20. 20.43 + ? = 100
  21. 21.65 + ? = 100
  22. 22.24 + ? = 100
  23. 23.40 + ? = 100
  24. 24.33 + ? = 100
  25. 25.56 + ? = 100
  26. 26.59 + ? = 100
  27. 27.86 + ? = 100
  28. 28.7 + ? = 10
  29. 29.68 + ? = 100
  30. 30.16 + ? = 100
  31. 31.69 + ? = 100
  32. 32.39 + ? = 100
  33. 33.8 + ? = 10
  34. 34.51 + ? = 100
  35. 35.12 + ? = 100
  36. 36.13 + ? = 100
  37. 37.18 + ? = 100
  38. 38.77 + ? = 100
  39. 39.66 + ? = 100
  40. 40.14 + ? = 100

Answer key

  1. 66
  2. 21
  3. 4
  4. 8
  5. 9
  6. 77
  7. 38
  8. 59
  9. 54
  10. 52
  11. 17
  12. 53
  13. 11
  14. 1
  15. 47
  16. 46
  17. 5
  18. 7
  19. 42
  20. 57
  21. 35
  22. 76
  23. 60
  24. 67
  25. 44
  26. 41
  27. 14
  28. 3
  29. 32
  30. 84
  31. 31
  32. 61
  33. 2
  34. 49
  35. 88
  36. 87
  37. 82
  38. 23
  39. 34
  40. 86

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