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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 24 · 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. 1.19 + ? = 100
  2. 2.66 + ? = 100
  3. 3.2 + ? = 10
  4. 4.5 + ? = 10
  5. 5.43 + ? = 100
  6. 6.1 + ? = 10
  7. 7.49 + ? = 100
  8. 8.87 + ? = 100
  9. 9.53 + ? = 100
  10. 10.6 + ? = 10
  11. 11.79 + ? = 100
  12. 12.76 + ? = 100
  13. 13.8 + ? = 10
  14. 14.55 + ? = 100
  15. 15.14 + ? = 100
  16. 16.26 + ? = 100
  17. 17.3 + ? = 10
  18. 18.30 + ? = 100
  19. 19.63 + ? = 100
  20. 20.40 + ? = 100
  21. 21.41 + ? = 100
  22. 22.21 + ? = 100
  23. 23.82 + ? = 100
  24. 24.27 + ? = 100
  25. 25.4 + ? = 10
  26. 26.29 + ? = 100
  27. 27.18 + ? = 100
  28. 28.7 + ? = 10
  29. 29.71 + ? = 100
  30. 30.83 + ? = 100
  31. 31.85 + ? = 100
  32. 32.32 + ? = 100
  33. 33.81 + ? = 100
  34. 34.58 + ? = 100
  35. 35.46 + ? = 100
  36. 36.24 + ? = 100
  37. 37.77 + ? = 100
  38. 38.59 + ? = 100
  39. 39.42 + ? = 100
  40. 40.39 + ? = 100

Answer key

  1. 81
  2. 34
  3. 8
  4. 5
  5. 57
  6. 9
  7. 51
  8. 13
  9. 47
  10. 4
  11. 21
  12. 24
  13. 2
  14. 45
  15. 86
  16. 74
  17. 7
  18. 70
  19. 37
  20. 60
  21. 59
  22. 79
  23. 18
  24. 73
  25. 6
  26. 71
  27. 82
  28. 3
  29. 29
  30. 17
  31. 15
  32. 68
  33. 19
  34. 42
  35. 54
  36. 76
  37. 23
  38. 41
  39. 58
  40. 61

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