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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 246 · 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. 1.2 + ? = 10
  2. 2.7 + ? = 10
  3. 3.19 + ? = 100
  4. 4.56 + ? = 100
  5. 5.3 + ? = 10
  6. 6.74 + ? = 100
  7. 7.4 + ? = 10
  8. 8.5 + ? = 10
  9. 9.26 + ? = 100
  10. 10.29 + ? = 100
  11. 11.21 + ? = 100
  12. 12.32 + ? = 100
  13. 13.36 + ? = 100
  14. 14.47 + ? = 100
  15. 15.49 + ? = 100
  16. 16.89 + ? = 100
  17. 17.8 + ? = 10
  18. 18.42 + ? = 100
  19. 19.27 + ? = 100
  20. 20.39 + ? = 100
  21. 21.13 + ? = 100
  22. 22.81 + ? = 100
  23. 23.52 + ? = 100
  24. 24.53 + ? = 100
  25. 25.71 + ? = 100
  26. 26.1 + ? = 10
  27. 27.43 + ? = 100
  28. 28.31 + ? = 100
  29. 29.25 + ? = 100
  30. 30.14 + ? = 100
  31. 31.6 + ? = 10
  32. 32.41 + ? = 100
  33. 33.59 + ? = 100
  34. 34.48 + ? = 100
  35. 35.15 + ? = 100
  36. 36.34 + ? = 100
  37. 37.54 + ? = 100
  38. 38.87 + ? = 100
  39. 39.86 + ? = 100
  40. 40.75 + ? = 100

Answer key

  1. 8
  2. 3
  3. 81
  4. 44
  5. 7
  6. 26
  7. 6
  8. 5
  9. 74
  10. 71
  11. 79
  12. 68
  13. 64
  14. 53
  15. 51
  16. 11
  17. 2
  18. 58
  19. 73
  20. 61
  21. 87
  22. 19
  23. 48
  24. 47
  25. 29
  26. 9
  27. 57
  28. 69
  29. 75
  30. 86
  31. 4
  32. 59
  33. 41
  34. 52
  35. 85
  36. 66
  37. 46
  38. 13
  39. 14
  40. 25

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