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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 419 · 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. 1.1 + ? = 10
  2. 2.3 + ? = 10
  3. 3.8 + ? = 10
  4. 4.16 + ? = 100
  5. 5.36 + ? = 100
  6. 6.4 + ? = 10
  7. 7.5 + ? = 10
  8. 8.43 + ? = 100
  9. 9.6 + ? = 10
  10. 10.56 + ? = 100
  11. 11.42 + ? = 100
  12. 12.27 + ? = 100
  13. 13.30 + ? = 100
  14. 14.53 + ? = 100
  15. 15.58 + ? = 100
  16. 16.28 + ? = 100
  17. 17.7 + ? = 10
  18. 18.41 + ? = 100
  19. 19.15 + ? = 100
  20. 20.77 + ? = 100
  21. 21.85 + ? = 100
  22. 22.12 + ? = 100
  23. 23.9 + ? = 10
  24. 24.86 + ? = 100
  25. 25.54 + ? = 100
  26. 26.72 + ? = 100
  27. 27.31 + ? = 100
  28. 28.2 + ? = 10
  29. 29.48 + ? = 100
  30. 30.20 + ? = 100
  31. 31.33 + ? = 100
  32. 32.32 + ? = 100
  33. 33.38 + ? = 100
  34. 34.61 + ? = 100
  35. 35.82 + ? = 100
  36. 36.11 + ? = 100
  37. 37.21 + ? = 100
  38. 38.22 + ? = 100
  39. 39.84 + ? = 100
  40. 40.71 + ? = 100

Answer key

  1. 9
  2. 7
  3. 2
  4. 84
  5. 64
  6. 6
  7. 5
  8. 57
  9. 4
  10. 44
  11. 58
  12. 73
  13. 70
  14. 47
  15. 42
  16. 72
  17. 3
  18. 59
  19. 85
  20. 23
  21. 15
  22. 88
  23. 1
  24. 14
  25. 46
  26. 28
  27. 69
  28. 8
  29. 52
  30. 80
  31. 67
  32. 68
  33. 62
  34. 39
  35. 18
  36. 89
  37. 79
  38. 78
  39. 16
  40. 29

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