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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 921 · 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. 2.26 + ? = 100
  3. 3.24 + ? = 100
  4. 4.7 + ? = 10
  5. 5.19 + ? = 100
  6. 6.20 + ? = 100
  7. 7.6 + ? = 10
  8. 8.1 + ? = 10
  9. 9.22 + ? = 100
  10. 10.58 + ? = 100
  11. 11.25 + ? = 100
  12. 12.44 + ? = 100
  13. 13.89 + ? = 100
  14. 14.18 + ? = 100
  15. 15.3 + ? = 10
  16. 16.32 + ? = 100
  17. 17.61 + ? = 100
  18. 18.14 + ? = 100
  19. 19.63 + ? = 100
  20. 20.43 + ? = 100
  21. 21.4 + ? = 10
  22. 22.9 + ? = 10
  23. 23.48 + ? = 100
  24. 24.8 + ? = 10
  25. 25.36 + ? = 100
  26. 26.39 + ? = 100
  27. 27.79 + ? = 100
  28. 28.16 + ? = 100
  29. 29.49 + ? = 100
  30. 30.56 + ? = 100
  31. 31.15 + ? = 100
  32. 32.2 + ? = 10
  33. 33.59 + ? = 100
  34. 34.31 + ? = 100
  35. 35.70 + ? = 100
  36. 36.77 + ? = 100
  37. 37.72 + ? = 100
  38. 38.5 + ? = 10
  39. 39.17 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 73
  2. 74
  3. 76
  4. 3
  5. 81
  6. 80
  7. 4
  8. 9
  9. 78
  10. 42
  11. 75
  12. 56
  13. 11
  14. 82
  15. 7
  16. 68
  17. 39
  18. 86
  19. 37
  20. 57
  21. 6
  22. 1
  23. 52
  24. 2
  25. 64
  26. 61
  27. 21
  28. 84
  29. 51
  30. 44
  31. 85
  32. 8
  33. 41
  34. 69
  35. 30
  36. 23
  37. 28
  38. 5
  39. 83
  40. 48

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