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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 450 · 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. 1.13 + ? = 100
  2. 2.48 + ? = 100
  3. 3.15 + ? = 100
  4. 4.3 + ? = 10
  5. 5.6 + ? = 10
  6. 6.4 + ? = 10
  7. 7.5 + ? = 10
  8. 8.67 + ? = 100
  9. 9.55 + ? = 100
  10. 10.21 + ? = 100
  11. 11.1 + ? = 10
  12. 12.36 + ? = 100
  13. 13.9 + ? = 10
  14. 14.89 + ? = 100
  15. 15.42 + ? = 100
  16. 16.28 + ? = 100
  17. 17.7 + ? = 10
  18. 18.71 + ? = 100
  19. 19.32 + ? = 100
  20. 20.12 + ? = 100
  21. 21.85 + ? = 100
  22. 22.23 + ? = 100
  23. 23.33 + ? = 100
  24. 24.38 + ? = 100
  25. 25.2 + ? = 10
  26. 26.75 + ? = 100
  27. 27.31 + ? = 100
  28. 28.49 + ? = 100
  29. 29.79 + ? = 100
  30. 30.77 + ? = 100
  31. 31.16 + ? = 100
  32. 32.11 + ? = 100
  33. 33.84 + ? = 100
  34. 34.8 + ? = 10
  35. 35.69 + ? = 100
  36. 36.44 + ? = 100
  37. 37.81 + ? = 100
  38. 38.46 + ? = 100
  39. 39.72 + ? = 100
  40. 40.25 + ? = 100

Answer key

  1. 87
  2. 52
  3. 85
  4. 7
  5. 4
  6. 6
  7. 5
  8. 33
  9. 45
  10. 79
  11. 9
  12. 64
  13. 1
  14. 11
  15. 58
  16. 72
  17. 3
  18. 29
  19. 68
  20. 88
  21. 15
  22. 77
  23. 67
  24. 62
  25. 8
  26. 25
  27. 69
  28. 51
  29. 21
  30. 23
  31. 84
  32. 89
  33. 16
  34. 2
  35. 31
  36. 56
  37. 19
  38. 54
  39. 28
  40. 75

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