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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 39 · 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. 1.19 + ? = 100
  2. 2.40 + ? = 100
  3. 3.2 + ? = 10
  4. 4.83 + ? = 100
  5. 5.47 + ? = 100
  6. 6.28 + ? = 100
  7. 7.53 + ? = 100
  8. 8.60 + ? = 100
  9. 9.80 + ? = 100
  10. 10.6 + ? = 10
  11. 11.54 + ? = 100
  12. 12.26 + ? = 100
  13. 13.62 + ? = 100
  14. 14.5 + ? = 10
  15. 15.4 + ? = 10
  16. 16.25 + ? = 100
  17. 17.42 + ? = 100
  18. 18.31 + ? = 100
  19. 19.77 + ? = 100
  20. 20.17 + ? = 100
  21. 21.8 + ? = 10
  22. 22.29 + ? = 100
  23. 23.39 + ? = 100
  24. 24.12 + ? = 100
  25. 25.24 + ? = 100
  26. 26.1 + ? = 10
  27. 27.45 + ? = 100
  28. 28.88 + ? = 100
  29. 29.9 + ? = 10
  30. 30.89 + ? = 100
  31. 31.14 + ? = 100
  32. 32.57 + ? = 100
  33. 33.66 + ? = 100
  34. 34.3 + ? = 10
  35. 35.49 + ? = 100
  36. 36.34 + ? = 100
  37. 37.65 + ? = 100
  38. 38.7 + ? = 10
  39. 39.36 + ? = 100
  40. 40.46 + ? = 100

Answer key

  1. 81
  2. 60
  3. 8
  4. 17
  5. 53
  6. 72
  7. 47
  8. 40
  9. 20
  10. 4
  11. 46
  12. 74
  13. 38
  14. 5
  15. 6
  16. 75
  17. 58
  18. 69
  19. 23
  20. 83
  21. 2
  22. 71
  23. 61
  24. 88
  25. 76
  26. 9
  27. 55
  28. 12
  29. 1
  30. 11
  31. 86
  32. 43
  33. 34
  34. 7
  35. 51
  36. 66
  37. 35
  38. 3
  39. 64
  40. 54

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