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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 412 · 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. 1.72 + ? = 100
  2. 2.31 + ? = 100
  3. 3.42 + ? = 100
  4. 4.7 + ? = 10
  5. 5.11 + ? = 100
  6. 6.79 + ? = 100
  7. 7.1 + ? = 10
  8. 8.59 + ? = 100
  9. 9.63 + ? = 100
  10. 10.9 + ? = 10
  11. 11.6 + ? = 10
  12. 12.68 + ? = 100
  13. 13.27 + ? = 100
  14. 14.2 + ? = 10
  15. 15.5 + ? = 10
  16. 16.50 + ? = 100
  17. 17.48 + ? = 100
  18. 18.51 + ? = 100
  19. 19.4 + ? = 10
  20. 20.3 + ? = 10
  21. 21.74 + ? = 100
  22. 22.84 + ? = 100
  23. 23.13 + ? = 100
  24. 24.16 + ? = 100
  25. 25.26 + ? = 100
  26. 26.47 + ? = 100
  27. 27.17 + ? = 100
  28. 28.39 + ? = 100
  29. 29.81 + ? = 100
  30. 30.58 + ? = 100
  31. 31.71 + ? = 100
  32. 32.8 + ? = 10
  33. 33.22 + ? = 100
  34. 34.32 + ? = 100
  35. 35.15 + ? = 100
  36. 36.57 + ? = 100
  37. 37.20 + ? = 100
  38. 38.86 + ? = 100
  39. 39.53 + ? = 100
  40. 40.69 + ? = 100

Answer key

  1. 28
  2. 69
  3. 58
  4. 3
  5. 89
  6. 21
  7. 9
  8. 41
  9. 37
  10. 1
  11. 4
  12. 32
  13. 73
  14. 8
  15. 5
  16. 50
  17. 52
  18. 49
  19. 6
  20. 7
  21. 26
  22. 16
  23. 87
  24. 84
  25. 74
  26. 53
  27. 83
  28. 61
  29. 19
  30. 42
  31. 29
  32. 2
  33. 78
  34. 68
  35. 85
  36. 43
  37. 80
  38. 14
  39. 47
  40. 31

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