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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 473 · 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. 1.78 + ? = 100
  2. 2.1 + ? = 10
  3. 3.2 + ? = 10
  4. 4.12 + ? = 100
  5. 5.28 + ? = 100
  6. 6.49 + ? = 100
  7. 7.80 + ? = 100
  8. 8.9 + ? = 10
  9. 9.82 + ? = 100
  10. 10.32 + ? = 100
  11. 11.84 + ? = 100
  12. 12.53 + ? = 100
  13. 13.15 + ? = 100
  14. 14.8 + ? = 10
  15. 15.7 + ? = 10
  16. 16.4 + ? = 10
  17. 17.68 + ? = 100
  18. 18.39 + ? = 100
  19. 19.6 + ? = 10
  20. 20.70 + ? = 100
  21. 21.48 + ? = 100
  22. 22.21 + ? = 100
  23. 23.55 + ? = 100
  24. 24.13 + ? = 100
  25. 25.85 + ? = 100
  26. 26.18 + ? = 100
  27. 27.69 + ? = 100
  28. 28.5 + ? = 10
  29. 29.86 + ? = 100
  30. 30.79 + ? = 100
  31. 31.27 + ? = 100
  32. 32.41 + ? = 100
  33. 33.25 + ? = 100
  34. 34.46 + ? = 100
  35. 35.54 + ? = 100
  36. 36.60 + ? = 100
  37. 37.71 + ? = 100
  38. 38.43 + ? = 100
  39. 39.83 + ? = 100
  40. 40.77 + ? = 100

Answer key

  1. 22
  2. 9
  3. 8
  4. 88
  5. 72
  6. 51
  7. 20
  8. 1
  9. 18
  10. 68
  11. 16
  12. 47
  13. 85
  14. 2
  15. 3
  16. 6
  17. 32
  18. 61
  19. 4
  20. 30
  21. 52
  22. 79
  23. 45
  24. 87
  25. 15
  26. 82
  27. 31
  28. 5
  29. 14
  30. 21
  31. 73
  32. 59
  33. 75
  34. 54
  35. 46
  36. 40
  37. 29
  38. 57
  39. 17
  40. 23

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