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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 30 · 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. 1.9 + ? = 10
  2. 2.4 + ? = 10
  3. 3.6 + ? = 10
  4. 4.2 + ? = 10
  5. 5.19 + ? = 100
  6. 6.63 + ? = 100
  7. 7.80 + ? = 100
  8. 8.24 + ? = 100
  9. 9.27 + ? = 100
  10. 10.66 + ? = 100
  11. 11.62 + ? = 100
  12. 12.42 + ? = 100
  13. 13.35 + ? = 100
  14. 14.87 + ? = 100
  15. 15.8 + ? = 10
  16. 16.84 + ? = 100
  17. 17.81 + ? = 100
  18. 18.3 + ? = 10
  19. 19.1 + ? = 10
  20. 20.48 + ? = 100
  21. 21.82 + ? = 100
  22. 22.32 + ? = 100
  23. 23.52 + ? = 100
  24. 24.7 + ? = 10
  25. 25.67 + ? = 100
  26. 26.70 + ? = 100
  27. 27.59 + ? = 100
  28. 28.41 + ? = 100
  29. 29.86 + ? = 100
  30. 30.5 + ? = 10
  31. 31.30 + ? = 100
  32. 32.40 + ? = 100
  33. 33.78 + ? = 100
  34. 34.75 + ? = 100
  35. 35.17 + ? = 100
  36. 36.20 + ? = 100
  37. 37.49 + ? = 100
  38. 38.12 + ? = 100
  39. 39.83 + ? = 100
  40. 40.11 + ? = 100

Answer key

  1. 1
  2. 6
  3. 4
  4. 8
  5. 81
  6. 37
  7. 20
  8. 76
  9. 73
  10. 34
  11. 38
  12. 58
  13. 65
  14. 13
  15. 2
  16. 16
  17. 19
  18. 7
  19. 9
  20. 52
  21. 18
  22. 68
  23. 48
  24. 3
  25. 33
  26. 30
  27. 41
  28. 59
  29. 14
  30. 5
  31. 70
  32. 60
  33. 22
  34. 25
  35. 83
  36. 80
  37. 51
  38. 88
  39. 17
  40. 89

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