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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 506 · 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. 1.6 + ? = 10
  2. 2.3 + ? = 10
  3. 3.23 + ? = 100
  4. 4.14 + ? = 100
  5. 5.8 + ? = 10
  6. 6.5 + ? = 10
  7. 7.66 + ? = 100
  8. 8.4 + ? = 10
  9. 9.70 + ? = 100
  10. 10.43 + ? = 100
  11. 11.61 + ? = 100
  12. 12.7 + ? = 10
  13. 13.1 + ? = 10
  14. 14.39 + ? = 100
  15. 15.42 + ? = 100
  16. 16.87 + ? = 100
  17. 17.17 + ? = 100
  18. 18.86 + ? = 100
  19. 19.2 + ? = 10
  20. 20.34 + ? = 100
  21. 21.27 + ? = 100
  22. 22.9 + ? = 10
  23. 23.54 + ? = 100
  24. 24.69 + ? = 100
  25. 25.47 + ? = 100
  26. 26.62 + ? = 100
  27. 27.29 + ? = 100
  28. 28.35 + ? = 100
  29. 29.89 + ? = 100
  30. 30.53 + ? = 100
  31. 31.13 + ? = 100
  32. 32.45 + ? = 100
  33. 33.58 + ? = 100
  34. 34.40 + ? = 100
  35. 35.15 + ? = 100
  36. 36.30 + ? = 100
  37. 37.32 + ? = 100
  38. 38.82 + ? = 100
  39. 39.85 + ? = 100
  40. 40.74 + ? = 100

Answer key

  1. 4
  2. 7
  3. 77
  4. 86
  5. 2
  6. 5
  7. 34
  8. 6
  9. 30
  10. 57
  11. 39
  12. 3
  13. 9
  14. 61
  15. 58
  16. 13
  17. 83
  18. 14
  19. 8
  20. 66
  21. 73
  22. 1
  23. 46
  24. 31
  25. 53
  26. 38
  27. 71
  28. 65
  29. 11
  30. 47
  31. 87
  32. 55
  33. 42
  34. 60
  35. 85
  36. 70
  37. 68
  38. 18
  39. 15
  40. 26

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