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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 873 · 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. 2.49 + ? = 100
  3. 3.42 + ? = 100
  4. 4.32 + ? = 100
  5. 5.43 + ? = 100
  6. 6.28 + ? = 100
  7. 7.51 + ? = 100
  8. 8.3 + ? = 10
  9. 9.7 + ? = 10
  10. 10.1 + ? = 10
  11. 11.5 + ? = 10
  12. 12.4 + ? = 10
  13. 13.82 + ? = 100
  14. 14.2 + ? = 10
  15. 15.9 + ? = 10
  16. 16.75 + ? = 100
  17. 17.55 + ? = 100
  18. 18.58 + ? = 100
  19. 19.53 + ? = 100
  20. 20.17 + ? = 100
  21. 21.84 + ? = 100
  22. 22.34 + ? = 100
  23. 23.73 + ? = 100
  24. 24.50 + ? = 100
  25. 25.25 + ? = 100
  26. 26.61 + ? = 100
  27. 27.36 + ? = 100
  28. 28.67 + ? = 100
  29. 29.56 + ? = 100
  30. 30.63 + ? = 100
  31. 31.21 + ? = 100
  32. 32.78 + ? = 100
  33. 33.6 + ? = 10
  34. 34.81 + ? = 100
  35. 35.12 + ? = 100
  36. 36.8 + ? = 10
  37. 37.18 + ? = 100
  38. 38.13 + ? = 100
  39. 39.46 + ? = 100
  40. 40.71 + ? = 100

Answer key

  1. 73
  2. 51
  3. 58
  4. 68
  5. 57
  6. 72
  7. 49
  8. 7
  9. 3
  10. 9
  11. 5
  12. 6
  13. 18
  14. 8
  15. 1
  16. 25
  17. 45
  18. 42
  19. 47
  20. 83
  21. 16
  22. 66
  23. 27
  24. 50
  25. 75
  26. 39
  27. 64
  28. 33
  29. 44
  30. 37
  31. 79
  32. 22
  33. 4
  34. 19
  35. 88
  36. 2
  37. 82
  38. 87
  39. 54
  40. 29

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