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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 604 · 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. 1.75 + ? = 100
  2. 2.1 + ? = 10
  3. 3.5 + ? = 10
  4. 4.7 + ? = 10
  5. 5.6 + ? = 10
  6. 6.9 + ? = 10
  7. 7.71 + ? = 100
  8. 8.25 + ? = 100
  9. 9.24 + ? = 100
  10. 10.3 + ? = 10
  11. 11.8 + ? = 10
  12. 12.31 + ? = 100
  13. 13.61 + ? = 100
  14. 14.60 + ? = 100
  15. 15.19 + ? = 100
  16. 16.12 + ? = 100
  17. 17.85 + ? = 100
  18. 18.4 + ? = 10
  19. 19.17 + ? = 100
  20. 20.79 + ? = 100
  21. 21.84 + ? = 100
  22. 22.40 + ? = 100
  23. 23.29 + ? = 100
  24. 24.77 + ? = 100
  25. 25.18 + ? = 100
  26. 26.73 + ? = 100
  27. 27.57 + ? = 100
  28. 28.2 + ? = 10
  29. 29.15 + ? = 100
  30. 30.37 + ? = 100
  31. 31.46 + ? = 100
  32. 32.45 + ? = 100
  33. 33.78 + ? = 100
  34. 34.26 + ? = 100
  35. 35.32 + ? = 100
  36. 36.36 + ? = 100
  37. 37.51 + ? = 100
  38. 38.33 + ? = 100
  39. 39.30 + ? = 100
  40. 40.66 + ? = 100

Answer key

  1. 25
  2. 9
  3. 5
  4. 3
  5. 4
  6. 1
  7. 29
  8. 75
  9. 76
  10. 7
  11. 2
  12. 69
  13. 39
  14. 40
  15. 81
  16. 88
  17. 15
  18. 6
  19. 83
  20. 21
  21. 16
  22. 60
  23. 71
  24. 23
  25. 82
  26. 27
  27. 43
  28. 8
  29. 85
  30. 63
  31. 54
  32. 55
  33. 22
  34. 74
  35. 68
  36. 64
  37. 49
  38. 67
  39. 70
  40. 34

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