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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 43 · 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. 1.3 + ? = 10
  2. 2.15 + ? = 100
  3. 3.32 + ? = 100
  4. 4.1 + ? = 10
  5. 5.43 + ? = 100
  6. 6.18 + ? = 100
  7. 7.8 + ? = 10
  8. 8.71 + ? = 100
  9. 9.6 + ? = 10
  10. 10.2 + ? = 10
  11. 11.21 + ? = 100
  12. 12.26 + ? = 100
  13. 13.7 + ? = 10
  14. 14.52 + ? = 100
  15. 15.4 + ? = 10
  16. 16.16 + ? = 100
  17. 17.77 + ? = 100
  18. 18.78 + ? = 100
  19. 19.89 + ? = 100
  20. 20.39 + ? = 100
  21. 21.33 + ? = 100
  22. 22.42 + ? = 100
  23. 23.49 + ? = 100
  24. 24.63 + ? = 100
  25. 25.17 + ? = 100
  26. 26.47 + ? = 100
  27. 27.23 + ? = 100
  28. 28.5 + ? = 10
  29. 29.48 + ? = 100
  30. 30.29 + ? = 100
  31. 31.86 + ? = 100
  32. 32.14 + ? = 100
  33. 33.76 + ? = 100
  34. 34.9 + ? = 10
  35. 35.25 + ? = 100
  36. 36.35 + ? = 100
  37. 37.79 + ? = 100
  38. 38.85 + ? = 100
  39. 39.12 + ? = 100
  40. 40.75 + ? = 100

Answer key

  1. 7
  2. 85
  3. 68
  4. 9
  5. 57
  6. 82
  7. 2
  8. 29
  9. 4
  10. 8
  11. 79
  12. 74
  13. 3
  14. 48
  15. 6
  16. 84
  17. 23
  18. 22
  19. 11
  20. 61
  21. 67
  22. 58
  23. 51
  24. 37
  25. 83
  26. 53
  27. 77
  28. 5
  29. 52
  30. 71
  31. 14
  32. 86
  33. 24
  34. 1
  35. 75
  36. 65
  37. 21
  38. 15
  39. 88
  40. 25

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