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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 607 · 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. 1.50 + ? = 100
  2. 2.44 + ? = 100
  3. 3.79 + ? = 100
  4. 4.1 + ? = 10
  5. 5.3 + ? = 10
  6. 6.45 + ? = 100
  7. 7.67 + ? = 100
  8. 8.2 + ? = 10
  9. 9.6 + ? = 10
  10. 10.8 + ? = 10
  11. 11.27 + ? = 100
  12. 12.78 + ? = 100
  13. 13.69 + ? = 100
  14. 14.65 + ? = 100
  15. 15.4 + ? = 10
  16. 16.34 + ? = 100
  17. 17.42 + ? = 100
  18. 18.86 + ? = 100
  19. 19.61 + ? = 100
  20. 20.71 + ? = 100
  21. 21.17 + ? = 100
  22. 22.22 + ? = 100
  23. 23.29 + ? = 100
  24. 24.7 + ? = 10
  25. 25.31 + ? = 100
  26. 26.38 + ? = 100
  27. 27.19 + ? = 100
  28. 28.5 + ? = 10
  29. 29.72 + ? = 100
  30. 30.43 + ? = 100
  31. 31.89 + ? = 100
  32. 32.83 + ? = 100
  33. 33.82 + ? = 100
  34. 34.26 + ? = 100
  35. 35.48 + ? = 100
  36. 36.81 + ? = 100
  37. 37.13 + ? = 100
  38. 38.25 + ? = 100
  39. 39.77 + ? = 100
  40. 40.9 + ? = 10

Answer key

  1. 50
  2. 56
  3. 21
  4. 9
  5. 7
  6. 55
  7. 33
  8. 8
  9. 4
  10. 2
  11. 73
  12. 22
  13. 31
  14. 35
  15. 6
  16. 66
  17. 58
  18. 14
  19. 39
  20. 29
  21. 83
  22. 78
  23. 71
  24. 3
  25. 69
  26. 62
  27. 81
  28. 5
  29. 28
  30. 57
  31. 11
  32. 17
  33. 18
  34. 74
  35. 52
  36. 19
  37. 87
  38. 75
  39. 23
  40. 1

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