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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 809 · 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. 1.20 + ? = 100
  2. 2.46 + ? = 100
  3. 3.47 + ? = 100
  4. 4.26 + ? = 100
  5. 5.2 + ? = 10
  6. 6.19 + ? = 100
  7. 7.50 + ? = 100
  8. 8.73 + ? = 100
  9. 9.12 + ? = 100
  10. 10.39 + ? = 100
  11. 11.74 + ? = 100
  12. 12.81 + ? = 100
  13. 13.5 + ? = 10
  14. 14.31 + ? = 100
  15. 15.8 + ? = 10
  16. 16.7 + ? = 10
  17. 17.75 + ? = 100
  18. 18.51 + ? = 100
  19. 19.9 + ? = 10
  20. 20.29 + ? = 100
  21. 21.1 + ? = 10
  22. 22.25 + ? = 100
  23. 23.28 + ? = 100
  24. 24.43 + ? = 100
  25. 25.59 + ? = 100
  26. 26.83 + ? = 100
  27. 27.62 + ? = 100
  28. 28.3 + ? = 10
  29. 29.37 + ? = 100
  30. 30.13 + ? = 100
  31. 31.30 + ? = 100
  32. 32.64 + ? = 100
  33. 33.38 + ? = 100
  34. 34.48 + ? = 100
  35. 35.27 + ? = 100
  36. 36.67 + ? = 100
  37. 37.77 + ? = 100
  38. 38.6 + ? = 10
  39. 39.17 + ? = 100
  40. 40.49 + ? = 100

Answer key

  1. 80
  2. 54
  3. 53
  4. 74
  5. 8
  6. 81
  7. 50
  8. 27
  9. 88
  10. 61
  11. 26
  12. 19
  13. 5
  14. 69
  15. 2
  16. 3
  17. 25
  18. 49
  19. 1
  20. 71
  21. 9
  22. 75
  23. 72
  24. 57
  25. 41
  26. 17
  27. 38
  28. 7
  29. 63
  30. 87
  31. 70
  32. 36
  33. 62
  34. 52
  35. 73
  36. 33
  37. 23
  38. 4
  39. 83
  40. 51

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