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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 256 · 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. 1.5 + ? = 10
  2. 2.2 + ? = 10
  3. 3.58 + ? = 100
  4. 4.30 + ? = 100
  5. 5.3 + ? = 10
  6. 6.8 + ? = 10
  7. 7.4 + ? = 10
  8. 8.20 + ? = 100
  9. 9.23 + ? = 100
  10. 10.1 + ? = 10
  11. 11.22 + ? = 100
  12. 12.70 + ? = 100
  13. 13.6 + ? = 10
  14. 14.18 + ? = 100
  15. 15.26 + ? = 100
  16. 16.12 + ? = 100
  17. 17.57 + ? = 100
  18. 18.41 + ? = 100
  19. 19.17 + ? = 100
  20. 20.14 + ? = 100
  21. 21.7 + ? = 10
  22. 22.82 + ? = 100
  23. 23.63 + ? = 100
  24. 24.84 + ? = 100
  25. 25.64 + ? = 100
  26. 26.9 + ? = 10
  27. 27.11 + ? = 100
  28. 28.76 + ? = 100
  29. 29.13 + ? = 100
  30. 30.45 + ? = 100
  31. 31.71 + ? = 100
  32. 32.31 + ? = 100
  33. 33.38 + ? = 100
  34. 34.83 + ? = 100
  35. 35.77 + ? = 100
  36. 36.25 + ? = 100
  37. 37.56 + ? = 100
  38. 38.47 + ? = 100
  39. 39.51 + ? = 100
  40. 40.72 + ? = 100

Answer key

  1. 5
  2. 8
  3. 42
  4. 70
  5. 7
  6. 2
  7. 6
  8. 80
  9. 77
  10. 9
  11. 78
  12. 30
  13. 4
  14. 82
  15. 74
  16. 88
  17. 43
  18. 59
  19. 83
  20. 86
  21. 3
  22. 18
  23. 37
  24. 16
  25. 36
  26. 1
  27. 89
  28. 24
  29. 87
  30. 55
  31. 29
  32. 69
  33. 62
  34. 17
  35. 23
  36. 75
  37. 44
  38. 53
  39. 49
  40. 28

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