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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 103 · 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. 2.66 + ? = 100
  3. 3.80 + ? = 100
  4. 4.64 + ? = 100
  5. 5.43 + ? = 100
  6. 6.49 + ? = 100
  7. 7.67 + ? = 100
  8. 8.5 + ? = 10
  9. 9.56 + ? = 100
  10. 10.6 + ? = 10
  11. 11.7 + ? = 10
  12. 12.42 + ? = 100
  13. 13.8 + ? = 10
  14. 14.3 + ? = 10
  15. 15.2 + ? = 10
  16. 16.18 + ? = 100
  17. 17.73 + ? = 100
  18. 18.31 + ? = 100
  19. 19.9 + ? = 10
  20. 20.77 + ? = 100
  21. 21.76 + ? = 100
  22. 22.48 + ? = 100
  23. 23.28 + ? = 100
  24. 24.24 + ? = 100
  25. 25.11 + ? = 100
  26. 26.21 + ? = 100
  27. 27.26 + ? = 100
  28. 28.79 + ? = 100
  29. 29.75 + ? = 100
  30. 30.25 + ? = 100
  31. 31.32 + ? = 100
  32. 32.59 + ? = 100
  33. 33.83 + ? = 100
  34. 34.38 + ? = 100
  35. 35.45 + ? = 100
  36. 36.61 + ? = 100
  37. 37.20 + ? = 100
  38. 38.72 + ? = 100
  39. 39.58 + ? = 100
  40. 40.33 + ? = 100

Answer key

  1. 9
  2. 34
  3. 20
  4. 36
  5. 57
  6. 51
  7. 33
  8. 5
  9. 44
  10. 4
  11. 3
  12. 58
  13. 2
  14. 7
  15. 8
  16. 82
  17. 27
  18. 69
  19. 1
  20. 23
  21. 24
  22. 52
  23. 72
  24. 76
  25. 89
  26. 79
  27. 74
  28. 21
  29. 25
  30. 75
  31. 68
  32. 41
  33. 17
  34. 62
  35. 55
  36. 39
  37. 80
  38. 28
  39. 42
  40. 67

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