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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 401 · 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. 1.27 + ? = 100
  2. 2.2 + ? = 10
  3. 3.6 + ? = 10
  4. 4.51 + ? = 100
  5. 5.1 + ? = 10
  6. 6.49 + ? = 100
  7. 7.68 + ? = 100
  8. 8.35 + ? = 100
  9. 9.5 + ? = 10
  10. 10.8 + ? = 10
  11. 11.7 + ? = 10
  12. 12.9 + ? = 10
  13. 13.71 + ? = 100
  14. 14.4 + ? = 10
  15. 15.57 + ? = 100
  16. 16.58 + ? = 100
  17. 17.84 + ? = 100
  18. 18.61 + ? = 100
  19. 19.73 + ? = 100
  20. 20.82 + ? = 100
  21. 21.17 + ? = 100
  22. 22.47 + ? = 100
  23. 23.15 + ? = 100
  24. 24.34 + ? = 100
  25. 25.67 + ? = 100
  26. 26.42 + ? = 100
  27. 27.11 + ? = 100
  28. 28.83 + ? = 100
  29. 29.66 + ? = 100
  30. 30.23 + ? = 100
  31. 31.29 + ? = 100
  32. 32.12 + ? = 100
  33. 33.44 + ? = 100
  34. 34.3 + ? = 10
  35. 35.63 + ? = 100
  36. 36.38 + ? = 100
  37. 37.28 + ? = 100
  38. 38.18 + ? = 100
  39. 39.75 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 73
  2. 8
  3. 4
  4. 49
  5. 9
  6. 51
  7. 32
  8. 65
  9. 5
  10. 2
  11. 3
  12. 1
  13. 29
  14. 6
  15. 43
  16. 42
  17. 16
  18. 39
  19. 27
  20. 18
  21. 83
  22. 53
  23. 85
  24. 66
  25. 33
  26. 58
  27. 89
  28. 17
  29. 34
  30. 77
  31. 71
  32. 88
  33. 56
  34. 7
  35. 37
  36. 62
  37. 72
  38. 82
  39. 25
  40. 48

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