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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 780 · 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. 1.35 + ? = 100
  2. 2.33 + ? = 100
  3. 3.15 + ? = 100
  4. 4.14 + ? = 100
  5. 5.41 + ? = 100
  6. 6.5 + ? = 10
  7. 7.13 + ? = 100
  8. 8.1 + ? = 10
  9. 9.27 + ? = 100
  10. 10.31 + ? = 100
  11. 11.49 + ? = 100
  12. 12.7 + ? = 10
  13. 13.3 + ? = 10
  14. 14.52 + ? = 100
  15. 15.26 + ? = 100
  16. 16.8 + ? = 10
  17. 17.59 + ? = 100
  18. 18.56 + ? = 100
  19. 19.4 + ? = 10
  20. 20.82 + ? = 100
  21. 21.78 + ? = 100
  22. 22.6 + ? = 10
  23. 23.2 + ? = 10
  24. 24.9 + ? = 10
  25. 25.20 + ? = 100
  26. 26.11 + ? = 100
  27. 27.79 + ? = 100
  28. 28.75 + ? = 100
  29. 29.29 + ? = 100
  30. 30.83 + ? = 100
  31. 31.47 + ? = 100
  32. 32.87 + ? = 100
  33. 33.73 + ? = 100
  34. 34.25 + ? = 100
  35. 35.42 + ? = 100
  36. 36.61 + ? = 100
  37. 37.16 + ? = 100
  38. 38.9 + ? = 10
  39. 39.19 + ? = 100
  40. 40.74 + ? = 100

Answer key

  1. 65
  2. 67
  3. 85
  4. 86
  5. 59
  6. 5
  7. 87
  8. 9
  9. 73
  10. 69
  11. 51
  12. 3
  13. 7
  14. 48
  15. 74
  16. 2
  17. 41
  18. 44
  19. 6
  20. 18
  21. 22
  22. 4
  23. 8
  24. 1
  25. 80
  26. 89
  27. 21
  28. 25
  29. 71
  30. 17
  31. 53
  32. 13
  33. 27
  34. 75
  35. 58
  36. 39
  37. 84
  38. 1
  39. 81
  40. 26

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