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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 349 · 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. 1.80 + ? = 100
  2. 2.3 + ? = 10
  3. 3.4 + ? = 10
  4. 4.63 + ? = 100
  5. 5.42 + ? = 100
  6. 6.1 + ? = 10
  7. 7.35 + ? = 100
  8. 8.9 + ? = 10
  9. 9.8 + ? = 10
  10. 10.25 + ? = 100
  11. 11.23 + ? = 100
  12. 12.11 + ? = 100
  13. 13.81 + ? = 100
  14. 14.83 + ? = 100
  15. 15.43 + ? = 100
  16. 16.82 + ? = 100
  17. 17.31 + ? = 100
  18. 18.67 + ? = 100
  19. 19.5 + ? = 10
  20. 20.7 + ? = 10
  21. 21.27 + ? = 100
  22. 22.13 + ? = 100
  23. 23.51 + ? = 100
  24. 24.6 + ? = 10
  25. 25.46 + ? = 100
  26. 26.59 + ? = 100
  27. 27.2 + ? = 10
  28. 28.48 + ? = 100
  29. 29.66 + ? = 100
  30. 30.64 + ? = 100
  31. 31.26 + ? = 100
  32. 32.28 + ? = 100
  33. 33.79 + ? = 100
  34. 34.58 + ? = 100
  35. 35.65 + ? = 100
  36. 36.54 + ? = 100
  37. 37.77 + ? = 100
  38. 38.52 + ? = 100
  39. 39.34 + ? = 100
  40. 40.21 + ? = 100

Answer key

  1. 20
  2. 7
  3. 6
  4. 37
  5. 58
  6. 9
  7. 65
  8. 1
  9. 2
  10. 75
  11. 77
  12. 89
  13. 19
  14. 17
  15. 57
  16. 18
  17. 69
  18. 33
  19. 5
  20. 3
  21. 73
  22. 87
  23. 49
  24. 4
  25. 54
  26. 41
  27. 8
  28. 52
  29. 34
  30. 36
  31. 74
  32. 72
  33. 21
  34. 42
  35. 35
  36. 46
  37. 23
  38. 48
  39. 66
  40. 79

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