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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 741 · 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. 1.15 + ? = 100
  2. 2.24 + ? = 100
  3. 3.71 + ? = 100
  4. 4.31 + ? = 100
  5. 5.48 + ? = 100
  6. 6.9 + ? = 10
  7. 7.5 + ? = 10
  8. 8.2 + ? = 10
  9. 9.1 + ? = 10
  10. 10.55 + ? = 100
  11. 11.73 + ? = 100
  12. 12.32 + ? = 100
  13. 13.44 + ? = 100
  14. 14.78 + ? = 100
  15. 15.69 + ? = 100
  16. 16.64 + ? = 100
  17. 17.7 + ? = 10
  18. 18.27 + ? = 100
  19. 19.22 + ? = 100
  20. 20.6 + ? = 10
  21. 21.8 + ? = 10
  22. 22.66 + ? = 100
  23. 23.82 + ? = 100
  24. 24.43 + ? = 100
  25. 25.18 + ? = 100
  26. 26.81 + ? = 100
  27. 27.89 + ? = 100
  28. 28.45 + ? = 100
  29. 29.19 + ? = 100
  30. 30.28 + ? = 100
  31. 31.30 + ? = 100
  32. 32.87 + ? = 100
  33. 33.3 + ? = 10
  34. 34.68 + ? = 100
  35. 35.76 + ? = 100
  36. 36.52 + ? = 100
  37. 37.60 + ? = 100
  38. 38.75 + ? = 100
  39. 39.35 + ? = 100
  40. 40.86 + ? = 100

Answer key

  1. 85
  2. 76
  3. 29
  4. 69
  5. 52
  6. 1
  7. 5
  8. 8
  9. 9
  10. 45
  11. 27
  12. 68
  13. 56
  14. 22
  15. 31
  16. 36
  17. 3
  18. 73
  19. 78
  20. 4
  21. 2
  22. 34
  23. 18
  24. 57
  25. 82
  26. 19
  27. 11
  28. 55
  29. 81
  30. 72
  31. 70
  32. 13
  33. 7
  34. 32
  35. 24
  36. 48
  37. 40
  38. 25
  39. 65
  40. 14

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