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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 457 · 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. 1.25 + ? = 100
  2. 2.23 + ? = 100
  3. 3.57 + ? = 100
  4. 4.1 + ? = 10
  5. 5.71 + ? = 100
  6. 6.60 + ? = 100
  7. 7.86 + ? = 100
  8. 8.77 + ? = 100
  9. 9.11 + ? = 100
  10. 10.4 + ? = 10
  11. 11.9 + ? = 10
  12. 12.20 + ? = 100
  13. 13.6 + ? = 10
  14. 14.66 + ? = 100
  15. 15.3 + ? = 10
  16. 16.5 + ? = 10
  17. 17.33 + ? = 100
  18. 18.65 + ? = 100
  19. 19.34 + ? = 100
  20. 20.18 + ? = 100
  21. 21.69 + ? = 100
  22. 22.84 + ? = 100
  23. 23.17 + ? = 100
  24. 24.16 + ? = 100
  25. 25.13 + ? = 100
  26. 26.2 + ? = 10
  27. 27.14 + ? = 100
  28. 28.8 + ? = 10
  29. 29.28 + ? = 100
  30. 30.7 + ? = 10
  31. 31.74 + ? = 100
  32. 32.54 + ? = 100
  33. 33.26 + ? = 100
  34. 34.72 + ? = 100
  35. 35.48 + ? = 100
  36. 36.49 + ? = 100
  37. 37.79 + ? = 100
  38. 38.78 + ? = 100
  39. 39.19 + ? = 100
  40. 40.64 + ? = 100

Answer key

  1. 75
  2. 77
  3. 43
  4. 9
  5. 29
  6. 40
  7. 14
  8. 23
  9. 89
  10. 6
  11. 1
  12. 80
  13. 4
  14. 34
  15. 7
  16. 5
  17. 67
  18. 35
  19. 66
  20. 82
  21. 31
  22. 16
  23. 83
  24. 84
  25. 87
  26. 8
  27. 86
  28. 2
  29. 72
  30. 3
  31. 26
  32. 46
  33. 74
  34. 28
  35. 52
  36. 51
  37. 21
  38. 22
  39. 81
  40. 36

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