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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 140 · 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. 1.5 + ? = 10
  2. 2.9 + ? = 10
  3. 3.8 + ? = 10
  4. 4.13 + ? = 100
  5. 5.55 + ? = 100
  6. 6.27 + ? = 100
  7. 7.11 + ? = 100
  8. 8.3 + ? = 10
  9. 9.35 + ? = 100
  10. 10.86 + ? = 100
  11. 11.21 + ? = 100
  12. 12.32 + ? = 100
  13. 13.52 + ? = 100
  14. 14.28 + ? = 100
  15. 15.42 + ? = 100
  16. 16.20 + ? = 100
  17. 17.60 + ? = 100
  18. 18.66 + ? = 100
  19. 19.59 + ? = 100
  20. 20.2 + ? = 10
  21. 21.23 + ? = 100
  22. 22.7 + ? = 10
  23. 23.4 + ? = 10
  24. 24.63 + ? = 100
  25. 25.1 + ? = 10
  26. 26.6 + ? = 10
  27. 27.44 + ? = 100
  28. 28.36 + ? = 100
  29. 29.82 + ? = 100
  30. 30.33 + ? = 100
  31. 31.47 + ? = 100
  32. 32.31 + ? = 100
  33. 33.62 + ? = 100
  34. 34.45 + ? = 100
  35. 35.30 + ? = 100
  36. 36.72 + ? = 100
  37. 37.40 + ? = 100
  38. 38.17 + ? = 100
  39. 39.16 + ? = 100
  40. 40.89 + ? = 100

Answer key

  1. 5
  2. 1
  3. 2
  4. 87
  5. 45
  6. 73
  7. 89
  8. 7
  9. 65
  10. 14
  11. 79
  12. 68
  13. 48
  14. 72
  15. 58
  16. 80
  17. 40
  18. 34
  19. 41
  20. 8
  21. 77
  22. 3
  23. 6
  24. 37
  25. 9
  26. 4
  27. 56
  28. 64
  29. 18
  30. 67
  31. 53
  32. 69
  33. 38
  34. 55
  35. 70
  36. 28
  37. 60
  38. 83
  39. 84
  40. 11

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