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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 595 · 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. 1.5 + ? = 10
  2. 2.56 + ? = 100
  3. 3.41 + ? = 100
  4. 4.19 + ? = 100
  5. 5.2 + ? = 10
  6. 6.8 + ? = 10
  7. 7.36 + ? = 100
  8. 8.6 + ? = 10
  9. 9.9 + ? = 10
  10. 10.77 + ? = 100
  11. 11.3 + ? = 10
  12. 12.1 + ? = 10
  13. 13.31 + ? = 100
  14. 14.13 + ? = 100
  15. 15.42 + ? = 100
  16. 16.49 + ? = 100
  17. 17.4 + ? = 10
  18. 18.37 + ? = 100
  19. 19.89 + ? = 100
  20. 20.55 + ? = 100
  21. 21.62 + ? = 100
  22. 22.23 + ? = 100
  23. 23.17 + ? = 100
  24. 24.25 + ? = 100
  25. 25.7 + ? = 10
  26. 26.35 + ? = 100
  27. 27.54 + ? = 100
  28. 28.44 + ? = 100
  29. 29.30 + ? = 100
  30. 30.39 + ? = 100
  31. 31.66 + ? = 100
  32. 32.12 + ? = 100
  33. 33.33 + ? = 100
  34. 34.60 + ? = 100
  35. 35.26 + ? = 100
  36. 36.24 + ? = 100
  37. 37.22 + ? = 100
  38. 38.85 + ? = 100
  39. 39.29 + ? = 100
  40. 40.82 + ? = 100

Answer key

  1. 5
  2. 44
  3. 59
  4. 81
  5. 8
  6. 2
  7. 64
  8. 4
  9. 1
  10. 23
  11. 7
  12. 9
  13. 69
  14. 87
  15. 58
  16. 51
  17. 6
  18. 63
  19. 11
  20. 45
  21. 38
  22. 77
  23. 83
  24. 75
  25. 3
  26. 65
  27. 46
  28. 56
  29. 70
  30. 61
  31. 34
  32. 88
  33. 67
  34. 40
  35. 74
  36. 76
  37. 78
  38. 15
  39. 71
  40. 18

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