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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 31 · 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. 1.1 + ? = 10
  2. 2.5 + ? = 10
  3. 3.63 + ? = 100
  4. 4.62 + ? = 100
  5. 5.89 + ? = 100
  6. 6.75 + ? = 100
  7. 7.36 + ? = 100
  8. 8.8 + ? = 10
  9. 9.2 + ? = 10
  10. 10.4 + ? = 10
  11. 11.30 + ? = 100
  12. 12.79 + ? = 100
  13. 13.9 + ? = 10
  14. 14.86 + ? = 100
  15. 15.26 + ? = 100
  16. 16.3 + ? = 10
  17. 17.48 + ? = 100
  18. 18.69 + ? = 100
  19. 19.44 + ? = 100
  20. 20.31 + ? = 100
  21. 21.24 + ? = 100
  22. 22.13 + ? = 100
  23. 23.29 + ? = 100
  24. 24.55 + ? = 100
  25. 25.16 + ? = 100
  26. 26.7 + ? = 10
  27. 27.6 + ? = 10
  28. 28.17 + ? = 100
  29. 29.15 + ? = 100
  30. 30.20 + ? = 100
  31. 31.19 + ? = 100
  32. 32.66 + ? = 100
  33. 33.33 + ? = 100
  34. 34.64 + ? = 100
  35. 35.51 + ? = 100
  36. 36.84 + ? = 100
  37. 37.81 + ? = 100
  38. 38.57 + ? = 100
  39. 39.54 + ? = 100
  40. 40.85 + ? = 100

Answer key

  1. 9
  2. 5
  3. 37
  4. 38
  5. 11
  6. 25
  7. 64
  8. 2
  9. 8
  10. 6
  11. 70
  12. 21
  13. 1
  14. 14
  15. 74
  16. 7
  17. 52
  18. 31
  19. 56
  20. 69
  21. 76
  22. 87
  23. 71
  24. 45
  25. 84
  26. 3
  27. 4
  28. 83
  29. 85
  30. 80
  31. 81
  32. 34
  33. 67
  34. 36
  35. 49
  36. 16
  37. 19
  38. 43
  39. 46
  40. 15

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