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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 715 · 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. 1.20 + ? = 100
  2. 2.8 + ? = 10
  3. 3.7 + ? = 10
  4. 4.4 + ? = 10
  5. 5.11 + ? = 100
  6. 6.9 + ? = 10
  7. 7.80 + ? = 100
  8. 8.1 + ? = 10
  9. 9.5 + ? = 10
  10. 10.54 + ? = 100
  11. 11.48 + ? = 100
  12. 12.66 + ? = 100
  13. 13.32 + ? = 100
  14. 14.43 + ? = 100
  15. 15.89 + ? = 100
  16. 16.6 + ? = 10
  17. 17.86 + ? = 100
  18. 18.22 + ? = 100
  19. 19.85 + ? = 100
  20. 20.28 + ? = 100
  21. 21.47 + ? = 100
  22. 22.2 + ? = 10
  23. 23.68 + ? = 100
  24. 24.33 + ? = 100
  25. 25.78 + ? = 100
  26. 26.60 + ? = 100
  27. 27.53 + ? = 100
  28. 28.35 + ? = 100
  29. 29.87 + ? = 100
  30. 30.36 + ? = 100
  31. 31.44 + ? = 100
  32. 32.18 + ? = 100
  33. 33.3 + ? = 10
  34. 34.34 + ? = 100
  35. 35.26 + ? = 100
  36. 36.39 + ? = 100
  37. 37.83 + ? = 100
  38. 38.84 + ? = 100
  39. 39.55 + ? = 100
  40. 40.58 + ? = 100

Answer key

  1. 80
  2. 2
  3. 3
  4. 6
  5. 89
  6. 1
  7. 20
  8. 9
  9. 5
  10. 46
  11. 52
  12. 34
  13. 68
  14. 57
  15. 11
  16. 4
  17. 14
  18. 78
  19. 15
  20. 72
  21. 53
  22. 8
  23. 32
  24. 67
  25. 22
  26. 40
  27. 47
  28. 65
  29. 13
  30. 64
  31. 56
  32. 82
  33. 7
  34. 66
  35. 74
  36. 61
  37. 17
  38. 16
  39. 45
  40. 42

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