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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 435 · 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. 1.15 + ? = 100
  2. 2.19 + ? = 100
  3. 3.39 + ? = 100
  4. 4.41 + ? = 100
  5. 5.1 + ? = 10
  6. 6.29 + ? = 100
  7. 7.35 + ? = 100
  8. 8.63 + ? = 100
  9. 9.8 + ? = 10
  10. 10.3 + ? = 10
  11. 11.32 + ? = 100
  12. 12.47 + ? = 100
  13. 13.12 + ? = 100
  14. 14.57 + ? = 100
  15. 15.52 + ? = 100
  16. 16.5 + ? = 10
  17. 17.84 + ? = 100
  18. 18.4 + ? = 10
  19. 19.6 + ? = 10
  20. 20.86 + ? = 100
  21. 21.61 + ? = 100
  22. 22.9 + ? = 10
  23. 23.69 + ? = 100
  24. 24.7 + ? = 10
  25. 25.18 + ? = 100
  26. 26.49 + ? = 100
  27. 27.42 + ? = 100
  28. 28.33 + ? = 100
  29. 29.24 + ? = 100
  30. 30.83 + ? = 100
  31. 31.2 + ? = 10
  32. 32.55 + ? = 100
  33. 33.50 + ? = 100
  34. 34.17 + ? = 100
  35. 35.85 + ? = 100
  36. 36.20 + ? = 100
  37. 37.14 + ? = 100
  38. 38.38 + ? = 100
  39. 39.76 + ? = 100
  40. 40.31 + ? = 100

Answer key

  1. 85
  2. 81
  3. 61
  4. 59
  5. 9
  6. 71
  7. 65
  8. 37
  9. 2
  10. 7
  11. 68
  12. 53
  13. 88
  14. 43
  15. 48
  16. 5
  17. 16
  18. 6
  19. 4
  20. 14
  21. 39
  22. 1
  23. 31
  24. 3
  25. 82
  26. 51
  27. 58
  28. 67
  29. 76
  30. 17
  31. 8
  32. 45
  33. 50
  34. 83
  35. 15
  36. 80
  37. 86
  38. 62
  39. 24
  40. 69

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