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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 350 · 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. 1.83 + ? = 100
  2. 2.62 + ? = 100
  3. 3.41 + ? = 100
  4. 4.49 + ? = 100
  5. 5.39 + ? = 100
  6. 6.3 + ? = 10
  7. 7.5 + ? = 10
  8. 8.16 + ? = 100
  9. 9.9 + ? = 10
  10. 10.37 + ? = 100
  11. 11.87 + ? = 100
  12. 12.51 + ? = 100
  13. 13.66 + ? = 100
  14. 14.81 + ? = 100
  15. 15.32 + ? = 100
  16. 16.6 + ? = 10
  17. 17.4 + ? = 10
  18. 18.7 + ? = 10
  19. 19.36 + ? = 100
  20. 20.84 + ? = 100
  21. 21.29 + ? = 100
  22. 22.67 + ? = 100
  23. 23.1 + ? = 10
  24. 24.68 + ? = 100
  25. 25.21 + ? = 100
  26. 26.14 + ? = 100
  27. 27.2 + ? = 10
  28. 28.19 + ? = 100
  29. 29.30 + ? = 100
  30. 30.12 + ? = 100
  31. 31.59 + ? = 100
  32. 32.27 + ? = 100
  33. 33.78 + ? = 100
  34. 34.24 + ? = 100
  35. 35.71 + ? = 100
  36. 36.40 + ? = 100
  37. 37.61 + ? = 100
  38. 38.45 + ? = 100
  39. 39.8 + ? = 10
  40. 40.64 + ? = 100

Answer key

  1. 17
  2. 38
  3. 59
  4. 51
  5. 61
  6. 7
  7. 5
  8. 84
  9. 1
  10. 63
  11. 13
  12. 49
  13. 34
  14. 19
  15. 68
  16. 4
  17. 6
  18. 3
  19. 64
  20. 16
  21. 71
  22. 33
  23. 9
  24. 32
  25. 79
  26. 86
  27. 8
  28. 81
  29. 70
  30. 88
  31. 41
  32. 73
  33. 22
  34. 76
  35. 29
  36. 60
  37. 39
  38. 55
  39. 2
  40. 36

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