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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 52 · 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. 2.2 + ? = 10
  3. 3.4 + ? = 10
  4. 4.8 + ? = 10
  5. 5.28 + ? = 100
  6. 6.40 + ? = 100
  7. 7.30 + ? = 100
  8. 8.34 + ? = 100
  9. 9.83 + ? = 100
  10. 10.87 + ? = 100
  11. 11.85 + ? = 100
  12. 12.12 + ? = 100
  13. 13.89 + ? = 100
  14. 14.84 + ? = 100
  15. 15.32 + ? = 100
  16. 16.21 + ? = 100
  17. 17.31 + ? = 100
  18. 18.9 + ? = 10
  19. 19.36 + ? = 100
  20. 20.75 + ? = 100
  21. 21.16 + ? = 100
  22. 22.73 + ? = 100
  23. 23.7 + ? = 10
  24. 24.5 + ? = 10
  25. 25.3 + ? = 10
  26. 26.1 + ? = 10
  27. 27.60 + ? = 100
  28. 28.14 + ? = 100
  29. 29.54 + ? = 100
  30. 30.64 + ? = 100
  31. 31.13 + ? = 100
  32. 32.65 + ? = 100
  33. 33.70 + ? = 100
  34. 34.42 + ? = 100
  35. 35.24 + ? = 100
  36. 36.41 + ? = 100
  37. 37.38 + ? = 100
  38. 38.61 + ? = 100
  39. 39.55 + ? = 100
  40. 40.23 + ? = 100

Answer key

  1. 4
  2. 8
  3. 6
  4. 2
  5. 72
  6. 60
  7. 70
  8. 66
  9. 17
  10. 13
  11. 15
  12. 88
  13. 11
  14. 16
  15. 68
  16. 79
  17. 69
  18. 1
  19. 64
  20. 25
  21. 84
  22. 27
  23. 3
  24. 5
  25. 7
  26. 9
  27. 40
  28. 86
  29. 46
  30. 36
  31. 87
  32. 35
  33. 30
  34. 58
  35. 76
  36. 59
  37. 62
  38. 39
  39. 45
  40. 77

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