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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 20 · 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. 1.75 + ? = 100
  2. 2.70 + ? = 100
  3. 3.21 + ? = 100
  4. 4.3 + ? = 10
  5. 5.13 + ? = 100
  6. 6.86 + ? = 100
  7. 7.2 + ? = 10
  8. 8.40 + ? = 100
  9. 9.73 + ? = 100
  10. 10.80 + ? = 100
  11. 11.4 + ? = 10
  12. 12.9 + ? = 10
  13. 13.17 + ? = 100
  14. 14.77 + ? = 100
  15. 15.69 + ? = 100
  16. 16.1 + ? = 10
  17. 17.7 + ? = 10
  18. 18.38 + ? = 100
  19. 19.6 + ? = 10
  20. 20.5 + ? = 10
  21. 21.8 + ? = 10
  22. 22.14 + ? = 100
  23. 23.41 + ? = 100
  24. 24.46 + ? = 100
  25. 25.49 + ? = 100
  26. 26.48 + ? = 100
  27. 27.83 + ? = 100
  28. 28.24 + ? = 100
  29. 29.68 + ? = 100
  30. 30.88 + ? = 100
  31. 31.64 + ? = 100
  32. 32.25 + ? = 100
  33. 33.71 + ? = 100
  34. 34.84 + ? = 100
  35. 35.28 + ? = 100
  36. 36.62 + ? = 100
  37. 37.87 + ? = 100
  38. 38.53 + ? = 100
  39. 39.12 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 25
  2. 30
  3. 79
  4. 7
  5. 87
  6. 14
  7. 8
  8. 60
  9. 27
  10. 20
  11. 6
  12. 1
  13. 83
  14. 23
  15. 31
  16. 9
  17. 3
  18. 62
  19. 4
  20. 5
  21. 2
  22. 86
  23. 59
  24. 54
  25. 51
  26. 52
  27. 17
  28. 76
  29. 32
  30. 12
  31. 36
  32. 75
  33. 29
  34. 16
  35. 72
  36. 38
  37. 13
  38. 47
  39. 88
  40. 81

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