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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 395 · 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. 2.37 + ? = 100
  3. 3.1 + ? = 10
  4. 4.56 + ? = 100
  5. 5.3 + ? = 10
  6. 6.16 + ? = 100
  7. 7.9 + ? = 10
  8. 8.82 + ? = 100
  9. 9.66 + ? = 100
  10. 10.75 + ? = 100
  11. 11.30 + ? = 100
  12. 12.86 + ? = 100
  13. 13.2 + ? = 10
  14. 14.5 + ? = 10
  15. 15.83 + ? = 100
  16. 16.29 + ? = 100
  17. 17.4 + ? = 10
  18. 18.65 + ? = 100
  19. 19.77 + ? = 100
  20. 20.13 + ? = 100
  21. 21.31 + ? = 100
  22. 22.7 + ? = 10
  23. 23.51 + ? = 100
  24. 24.68 + ? = 100
  25. 25.21 + ? = 100
  26. 26.27 + ? = 100
  27. 27.22 + ? = 100
  28. 28.34 + ? = 100
  29. 29.28 + ? = 100
  30. 30.11 + ? = 100
  31. 31.61 + ? = 100
  32. 32.12 + ? = 100
  33. 33.81 + ? = 100
  34. 34.8 + ? = 10
  35. 35.44 + ? = 100
  36. 36.47 + ? = 100
  37. 37.3 + ? = 10
  38. 38.52 + ? = 100
  39. 39.54 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 45
  2. 63
  3. 9
  4. 44
  5. 7
  6. 84
  7. 1
  8. 18
  9. 34
  10. 25
  11. 70
  12. 14
  13. 8
  14. 5
  15. 17
  16. 71
  17. 6
  18. 35
  19. 23
  20. 87
  21. 69
  22. 3
  23. 49
  24. 32
  25. 79
  26. 73
  27. 78
  28. 66
  29. 72
  30. 89
  31. 39
  32. 88
  33. 19
  34. 2
  35. 56
  36. 53
  37. 7
  38. 48
  39. 46
  40. 22

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