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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 218 · 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. 1.7 + ? = 10
  2. 2.38 + ? = 100
  3. 3.4 + ? = 10
  4. 4.9 + ? = 10
  5. 5.80 + ? = 100
  6. 6.6 + ? = 10
  7. 7.25 + ? = 100
  8. 8.83 + ? = 100
  9. 9.20 + ? = 100
  10. 10.3 + ? = 10
  11. 11.42 + ? = 100
  12. 12.8 + ? = 10
  13. 13.2 + ? = 10
  14. 14.44 + ? = 100
  15. 15.5 + ? = 10
  16. 16.1 + ? = 10
  17. 17.28 + ? = 100
  18. 18.21 + ? = 100
  19. 19.41 + ? = 100
  20. 20.86 + ? = 100
  21. 21.39 + ? = 100
  22. 22.66 + ? = 100
  23. 23.15 + ? = 100
  24. 24.12 + ? = 100
  25. 25.27 + ? = 100
  26. 26.29 + ? = 100
  27. 27.37 + ? = 100
  28. 28.43 + ? = 100
  29. 29.48 + ? = 100
  30. 30.35 + ? = 100
  31. 31.19 + ? = 100
  32. 32.64 + ? = 100
  33. 33.47 + ? = 100
  34. 34.81 + ? = 100
  35. 35.23 + ? = 100
  36. 36.68 + ? = 100
  37. 37.88 + ? = 100
  38. 38.17 + ? = 100
  39. 39.68 + ? = 100
  40. 40.57 + ? = 100

Answer key

  1. 3
  2. 62
  3. 6
  4. 1
  5. 20
  6. 4
  7. 75
  8. 17
  9. 80
  10. 7
  11. 58
  12. 2
  13. 8
  14. 56
  15. 5
  16. 9
  17. 72
  18. 79
  19. 59
  20. 14
  21. 61
  22. 34
  23. 85
  24. 88
  25. 73
  26. 71
  27. 63
  28. 57
  29. 52
  30. 65
  31. 81
  32. 36
  33. 53
  34. 19
  35. 77
  36. 32
  37. 12
  38. 83
  39. 32
  40. 43

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