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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 695 · 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. 1.27 + ? = 100
  2. 2.34 + ? = 100
  3. 3.6 + ? = 10
  4. 4.9 + ? = 10
  5. 5.41 + ? = 100
  6. 6.20 + ? = 100
  7. 7.4 + ? = 10
  8. 8.3 + ? = 10
  9. 9.2 + ? = 10
  10. 10.75 + ? = 100
  11. 11.7 + ? = 10
  12. 12.5 + ? = 10
  13. 13.73 + ? = 100
  14. 14.72 + ? = 100
  15. 15.49 + ? = 100
  16. 16.76 + ? = 100
  17. 17.69 + ? = 100
  18. 18.31 + ? = 100
  19. 19.82 + ? = 100
  20. 20.65 + ? = 100
  21. 21.43 + ? = 100
  22. 22.59 + ? = 100
  23. 23.16 + ? = 100
  24. 24.70 + ? = 100
  25. 25.66 + ? = 100
  26. 26.29 + ? = 100
  27. 27.64 + ? = 100
  28. 28.1 + ? = 10
  29. 29.62 + ? = 100
  30. 30.32 + ? = 100
  31. 31.8 + ? = 10
  32. 32.11 + ? = 100
  33. 33.50 + ? = 100
  34. 34.85 + ? = 100
  35. 35.36 + ? = 100
  36. 36.87 + ? = 100
  37. 37.40 + ? = 100
  38. 38.48 + ? = 100
  39. 39.84 + ? = 100
  40. 40.39 + ? = 100

Answer key

  1. 73
  2. 66
  3. 4
  4. 1
  5. 59
  6. 80
  7. 6
  8. 7
  9. 8
  10. 25
  11. 3
  12. 5
  13. 27
  14. 28
  15. 51
  16. 24
  17. 31
  18. 69
  19. 18
  20. 35
  21. 57
  22. 41
  23. 84
  24. 30
  25. 34
  26. 71
  27. 36
  28. 9
  29. 38
  30. 68
  31. 2
  32. 89
  33. 50
  34. 15
  35. 64
  36. 13
  37. 60
  38. 52
  39. 16
  40. 61

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