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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 677 · 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. 1.18 + ? = 100
  2. 2.17 + ? = 100
  3. 3.4 + ? = 10
  4. 4.7 + ? = 10
  5. 5.19 + ? = 100
  6. 6.8 + ? = 10
  7. 7.1 + ? = 10
  8. 8.37 + ? = 100
  9. 9.87 + ? = 100
  10. 10.23 + ? = 100
  11. 11.39 + ? = 100
  12. 12.88 + ? = 100
  13. 13.50 + ? = 100
  14. 14.2 + ? = 10
  15. 15.79 + ? = 100
  16. 16.22 + ? = 100
  17. 17.80 + ? = 100
  18. 18.69 + ? = 100
  19. 19.47 + ? = 100
  20. 20.27 + ? = 100
  21. 21.57 + ? = 100
  22. 22.89 + ? = 100
  23. 23.78 + ? = 100
  24. 24.64 + ? = 100
  25. 25.6 + ? = 10
  26. 26.74 + ? = 100
  27. 27.5 + ? = 10
  28. 28.28 + ? = 100
  29. 29.76 + ? = 100
  30. 30.9 + ? = 10
  31. 31.48 + ? = 100
  32. 32.13 + ? = 100
  33. 33.71 + ? = 100
  34. 34.21 + ? = 100
  35. 35.16 + ? = 100
  36. 36.86 + ? = 100
  37. 37.68 + ? = 100
  38. 38.61 + ? = 100
  39. 39.53 + ? = 100
  40. 40.32 + ? = 100

Answer key

  1. 82
  2. 83
  3. 6
  4. 3
  5. 81
  6. 2
  7. 9
  8. 63
  9. 13
  10. 77
  11. 61
  12. 12
  13. 50
  14. 8
  15. 21
  16. 78
  17. 20
  18. 31
  19. 53
  20. 73
  21. 43
  22. 11
  23. 22
  24. 36
  25. 4
  26. 26
  27. 5
  28. 72
  29. 24
  30. 1
  31. 52
  32. 87
  33. 29
  34. 79
  35. 84
  36. 14
  37. 32
  38. 39
  39. 47
  40. 68

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