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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 198 · 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. 1.79 + ? = 100
  2. 2.51 + ? = 100
  3. 3.70 + ? = 100
  4. 4.78 + ? = 100
  5. 5.3 + ? = 10
  6. 6.33 + ? = 100
  7. 7.5 + ? = 10
  8. 8.30 + ? = 100
  9. 9.19 + ? = 100
  10. 10.6 + ? = 10
  11. 11.35 + ? = 100
  12. 12.64 + ? = 100
  13. 13.32 + ? = 100
  14. 14.7 + ? = 10
  15. 15.46 + ? = 100
  16. 16.4 + ? = 10
  17. 17.47 + ? = 100
  18. 18.2 + ? = 10
  19. 19.44 + ? = 100
  20. 20.14 + ? = 100
  21. 21.12 + ? = 100
  22. 22.81 + ? = 100
  23. 23.8 + ? = 10
  24. 24.1 + ? = 10
  25. 25.77 + ? = 100
  26. 26.9 + ? = 10
  27. 27.42 + ? = 100
  28. 28.68 + ? = 100
  29. 29.22 + ? = 100
  30. 30.53 + ? = 100
  31. 31.31 + ? = 100
  32. 32.59 + ? = 100
  33. 33.73 + ? = 100
  34. 34.43 + ? = 100
  35. 35.40 + ? = 100
  36. 36.61 + ? = 100
  37. 37.75 + ? = 100
  38. 38.26 + ? = 100
  39. 39.13 + ? = 100
  40. 40.49 + ? = 100

Answer key

  1. 21
  2. 49
  3. 30
  4. 22
  5. 7
  6. 67
  7. 5
  8. 70
  9. 81
  10. 4
  11. 65
  12. 36
  13. 68
  14. 3
  15. 54
  16. 6
  17. 53
  18. 8
  19. 56
  20. 86
  21. 88
  22. 19
  23. 2
  24. 9
  25. 23
  26. 1
  27. 58
  28. 32
  29. 78
  30. 47
  31. 69
  32. 41
  33. 27
  34. 57
  35. 60
  36. 39
  37. 25
  38. 74
  39. 87
  40. 51

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