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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 570 · 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. 1.21 + ? = 100
  2. 2.26 + ? = 100
  3. 3.81 + ? = 100
  4. 4.27 + ? = 100
  5. 5.47 + ? = 100
  6. 6.3 + ? = 10
  7. 7.51 + ? = 100
  8. 8.5 + ? = 10
  9. 9.28 + ? = 100
  10. 10.6 + ? = 10
  11. 11.64 + ? = 100
  12. 12.77 + ? = 100
  13. 13.32 + ? = 100
  14. 14.11 + ? = 100
  15. 15.1 + ? = 10
  16. 16.24 + ? = 100
  17. 17.61 + ? = 100
  18. 18.89 + ? = 100
  19. 19.16 + ? = 100
  20. 20.4 + ? = 10
  21. 21.60 + ? = 100
  22. 22.42 + ? = 100
  23. 23.69 + ? = 100
  24. 24.23 + ? = 100
  25. 25.48 + ? = 100
  26. 26.17 + ? = 100
  27. 27.73 + ? = 100
  28. 28.13 + ? = 100
  29. 29.78 + ? = 100
  30. 30.8 + ? = 10
  31. 31.2 + ? = 10
  32. 32.62 + ? = 100
  33. 33.9 + ? = 10
  34. 34.45 + ? = 100
  35. 35.83 + ? = 100
  36. 36.7 + ? = 10
  37. 37.19 + ? = 100
  38. 38.20 + ? = 100
  39. 39.41 + ? = 100
  40. 40.14 + ? = 100

Answer key

  1. 79
  2. 74
  3. 19
  4. 73
  5. 53
  6. 7
  7. 49
  8. 5
  9. 72
  10. 4
  11. 36
  12. 23
  13. 68
  14. 89
  15. 9
  16. 76
  17. 39
  18. 11
  19. 84
  20. 6
  21. 40
  22. 58
  23. 31
  24. 77
  25. 52
  26. 83
  27. 27
  28. 87
  29. 22
  30. 2
  31. 8
  32. 38
  33. 1
  34. 55
  35. 17
  36. 3
  37. 81
  38. 80
  39. 59
  40. 86

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