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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 264 · 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. 1.21 + ? = 100
  2. 2.5 + ? = 10
  3. 3.52 + ? = 100
  4. 4.70 + ? = 100
  5. 5.18 + ? = 100
  6. 6.4 + ? = 10
  7. 7.6 + ? = 10
  8. 8.89 + ? = 100
  9. 9.32 + ? = 100
  10. 10.80 + ? = 100
  11. 11.37 + ? = 100
  12. 12.72 + ? = 100
  13. 13.25 + ? = 100
  14. 14.9 + ? = 10
  15. 15.56 + ? = 100
  16. 16.1 + ? = 10
  17. 17.8 + ? = 10
  18. 18.64 + ? = 100
  19. 19.82 + ? = 100
  20. 20.17 + ? = 100
  21. 21.28 + ? = 100
  22. 22.86 + ? = 100
  23. 23.50 + ? = 100
  24. 24.31 + ? = 100
  25. 25.71 + ? = 100
  26. 26.88 + ? = 100
  27. 27.2 + ? = 10
  28. 28.7 + ? = 10
  29. 29.14 + ? = 100
  30. 30.3 + ? = 10
  31. 31.48 + ? = 100
  32. 32.34 + ? = 100
  33. 33.75 + ? = 100
  34. 34.15 + ? = 100
  35. 35.30 + ? = 100
  36. 36.66 + ? = 100
  37. 37.65 + ? = 100
  38. 38.35 + ? = 100
  39. 39.46 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 79
  2. 5
  3. 48
  4. 30
  5. 82
  6. 6
  7. 4
  8. 11
  9. 68
  10. 20
  11. 63
  12. 28
  13. 75
  14. 1
  15. 44
  16. 9
  17. 2
  18. 36
  19. 18
  20. 83
  21. 72
  22. 14
  23. 50
  24. 69
  25. 29
  26. 12
  27. 8
  28. 3
  29. 86
  30. 7
  31. 52
  32. 66
  33. 25
  34. 85
  35. 70
  36. 34
  37. 35
  38. 65
  39. 54
  40. 60

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