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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 253 · 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. 1.49 + ? = 100
  2. 2.26 + ? = 100
  3. 3.4 + ? = 10
  4. 4.80 + ? = 100
  5. 5.1 + ? = 10
  6. 6.51 + ? = 100
  7. 7.21 + ? = 100
  8. 8.61 + ? = 100
  9. 9.9 + ? = 10
  10. 10.30 + ? = 100
  11. 11.24 + ? = 100
  12. 12.25 + ? = 100
  13. 13.50 + ? = 100
  14. 14.64 + ? = 100
  15. 15.63 + ? = 100
  16. 16.35 + ? = 100
  17. 17.70 + ? = 100
  18. 18.75 + ? = 100
  19. 19.16 + ? = 100
  20. 20.2 + ? = 10
  21. 21.6 + ? = 10
  22. 22.7 + ? = 10
  23. 23.32 + ? = 100
  24. 24.5 + ? = 10
  25. 25.15 + ? = 100
  26. 26.17 + ? = 100
  27. 27.8 + ? = 10
  28. 28.79 + ? = 100
  29. 29.60 + ? = 100
  30. 30.85 + ? = 100
  31. 31.74 + ? = 100
  32. 32.39 + ? = 100
  33. 33.68 + ? = 100
  34. 34.48 + ? = 100
  35. 35.33 + ? = 100
  36. 36.3 + ? = 10
  37. 37.43 + ? = 100
  38. 38.18 + ? = 100
  39. 39.83 + ? = 100
  40. 40.69 + ? = 100

Answer key

  1. 51
  2. 74
  3. 6
  4. 20
  5. 9
  6. 49
  7. 79
  8. 39
  9. 1
  10. 70
  11. 76
  12. 75
  13. 50
  14. 36
  15. 37
  16. 65
  17. 30
  18. 25
  19. 84
  20. 8
  21. 4
  22. 3
  23. 68
  24. 5
  25. 85
  26. 83
  27. 2
  28. 21
  29. 40
  30. 15
  31. 26
  32. 61
  33. 32
  34. 52
  35. 67
  36. 7
  37. 57
  38. 82
  39. 17
  40. 31

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