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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 108 · 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. 1.9 + ? = 10
  2. 2.5 + ? = 10
  3. 3.8 + ? = 10
  4. 4.50 + ? = 100
  5. 5.75 + ? = 100
  6. 6.89 + ? = 100
  7. 7.7 + ? = 10
  8. 8.12 + ? = 100
  9. 9.4 + ? = 10
  10. 10.3 + ? = 10
  11. 11.30 + ? = 100
  12. 12.60 + ? = 100
  13. 13.84 + ? = 100
  14. 14.77 + ? = 100
  15. 15.78 + ? = 100
  16. 16.35 + ? = 100
  17. 17.2 + ? = 10
  18. 18.22 + ? = 100
  19. 19.24 + ? = 100
  20. 20.51 + ? = 100
  21. 21.1 + ? = 10
  22. 22.64 + ? = 100
  23. 23.54 + ? = 100
  24. 24.41 + ? = 100
  25. 25.85 + ? = 100
  26. 26.33 + ? = 100
  27. 27.81 + ? = 100
  28. 28.70 + ? = 100
  29. 29.17 + ? = 100
  30. 30.6 + ? = 10
  31. 31.88 + ? = 100
  32. 32.32 + ? = 100
  33. 33.56 + ? = 100
  34. 34.82 + ? = 100
  35. 35.23 + ? = 100
  36. 36.79 + ? = 100
  37. 37.43 + ? = 100
  38. 38.37 + ? = 100
  39. 39.47 + ? = 100
  40. 40.29 + ? = 100

Answer key

  1. 1
  2. 5
  3. 2
  4. 50
  5. 25
  6. 11
  7. 3
  8. 88
  9. 6
  10. 7
  11. 70
  12. 40
  13. 16
  14. 23
  15. 22
  16. 65
  17. 8
  18. 78
  19. 76
  20. 49
  21. 9
  22. 36
  23. 46
  24. 59
  25. 15
  26. 67
  27. 19
  28. 30
  29. 83
  30. 4
  31. 12
  32. 68
  33. 44
  34. 18
  35. 77
  36. 21
  37. 57
  38. 63
  39. 53
  40. 71

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