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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 60 · 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. 1.7 + ? = 10
  2. 2.74 + ? = 100
  3. 3.48 + ? = 100
  4. 4.1 + ? = 10
  5. 5.8 + ? = 10
  6. 6.20 + ? = 100
  7. 7.31 + ? = 100
  8. 8.9 + ? = 10
  9. 9.69 + ? = 100
  10. 10.2 + ? = 10
  11. 11.70 + ? = 100
  12. 12.3 + ? = 10
  13. 13.4 + ? = 10
  14. 14.61 + ? = 100
  15. 15.58 + ? = 100
  16. 16.34 + ? = 100
  17. 17.11 + ? = 100
  18. 18.88 + ? = 100
  19. 19.13 + ? = 100
  20. 20.37 + ? = 100
  21. 21.5 + ? = 10
  22. 22.25 + ? = 100
  23. 23.83 + ? = 100
  24. 24.62 + ? = 100
  25. 25.67 + ? = 100
  26. 26.82 + ? = 100
  27. 27.84 + ? = 100
  28. 28.17 + ? = 100
  29. 29.26 + ? = 100
  30. 30.66 + ? = 100
  31. 31.32 + ? = 100
  32. 32.6 + ? = 10
  33. 33.49 + ? = 100
  34. 34.65 + ? = 100
  35. 35.46 + ? = 100
  36. 36.56 + ? = 100
  37. 37.16 + ? = 100
  38. 38.72 + ? = 100
  39. 39.44 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 3
  2. 26
  3. 52
  4. 9
  5. 2
  6. 80
  7. 69
  8. 1
  9. 31
  10. 8
  11. 30
  12. 7
  13. 6
  14. 39
  15. 42
  16. 66
  17. 89
  18. 12
  19. 87
  20. 63
  21. 5
  22. 75
  23. 17
  24. 38
  25. 33
  26. 18
  27. 16
  28. 83
  29. 74
  30. 34
  31. 68
  32. 4
  33. 51
  34. 35
  35. 54
  36. 44
  37. 84
  38. 28
  39. 56
  40. 22

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