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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 441 · 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. 1.13 + ? = 100
  2. 2.86 + ? = 100
  3. 3.39 + ? = 100
  4. 4.88 + ? = 100
  5. 5.54 + ? = 100
  6. 6.59 + ? = 100
  7. 7.1 + ? = 10
  8. 8.42 + ? = 100
  9. 9.71 + ? = 100
  10. 10.5 + ? = 10
  11. 11.14 + ? = 100
  12. 12.32 + ? = 100
  13. 13.3 + ? = 10
  14. 14.8 + ? = 10
  15. 15.21 + ? = 100
  16. 16.79 + ? = 100
  17. 17.2 + ? = 10
  18. 18.45 + ? = 100
  19. 19.66 + ? = 100
  20. 20.75 + ? = 100
  21. 21.4 + ? = 10
  22. 22.15 + ? = 100
  23. 23.38 + ? = 100
  24. 24.72 + ? = 100
  25. 25.67 + ? = 100
  26. 26.6 + ? = 10
  27. 27.84 + ? = 100
  28. 28.36 + ? = 100
  29. 29.25 + ? = 100
  30. 30.77 + ? = 100
  31. 31.7 + ? = 10
  32. 32.74 + ? = 100
  33. 33.83 + ? = 100
  34. 34.9 + ? = 10
  35. 35.89 + ? = 100
  36. 36.61 + ? = 100
  37. 37.30 + ? = 100
  38. 38.50 + ? = 100
  39. 39.69 + ? = 100
  40. 40.73 + ? = 100

Answer key

  1. 87
  2. 14
  3. 61
  4. 12
  5. 46
  6. 41
  7. 9
  8. 58
  9. 29
  10. 5
  11. 86
  12. 68
  13. 7
  14. 2
  15. 79
  16. 21
  17. 8
  18. 55
  19. 34
  20. 25
  21. 6
  22. 85
  23. 62
  24. 28
  25. 33
  26. 4
  27. 16
  28. 64
  29. 75
  30. 23
  31. 3
  32. 26
  33. 17
  34. 1
  35. 11
  36. 39
  37. 70
  38. 50
  39. 31
  40. 27

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