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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 488 · 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. 1.55 + ? = 100
  2. 2.83 + ? = 100
  3. 3.85 + ? = 100
  4. 4.24 + ? = 100
  5. 5.79 + ? = 100
  6. 6.61 + ? = 100
  7. 7.13 + ? = 100
  8. 8.15 + ? = 100
  9. 9.33 + ? = 100
  10. 10.9 + ? = 10
  11. 11.77 + ? = 100
  12. 12.5 + ? = 10
  13. 13.3 + ? = 10
  14. 14.2 + ? = 10
  15. 15.36 + ? = 100
  16. 16.74 + ? = 100
  17. 17.25 + ? = 100
  18. 18.19 + ? = 100
  19. 19.70 + ? = 100
  20. 20.51 + ? = 100
  21. 21.6 + ? = 10
  22. 22.8 + ? = 10
  23. 23.4 + ? = 10
  24. 24.82 + ? = 100
  25. 25.68 + ? = 100
  26. 26.1 + ? = 10
  27. 27.18 + ? = 100
  28. 28.22 + ? = 100
  29. 29.27 + ? = 100
  30. 30.7 + ? = 10
  31. 31.86 + ? = 100
  32. 32.29 + ? = 100
  33. 33.49 + ? = 100
  34. 34.44 + ? = 100
  35. 35.31 + ? = 100
  36. 36.69 + ? = 100
  37. 37.12 + ? = 100
  38. 38.89 + ? = 100
  39. 39.60 + ? = 100
  40. 40.71 + ? = 100

Answer key

  1. 45
  2. 17
  3. 15
  4. 76
  5. 21
  6. 39
  7. 87
  8. 85
  9. 67
  10. 1
  11. 23
  12. 5
  13. 7
  14. 8
  15. 64
  16. 26
  17. 75
  18. 81
  19. 30
  20. 49
  21. 4
  22. 2
  23. 6
  24. 18
  25. 32
  26. 9
  27. 82
  28. 78
  29. 73
  30. 3
  31. 14
  32. 71
  33. 51
  34. 56
  35. 69
  36. 31
  37. 88
  38. 11
  39. 40
  40. 29

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