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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 165 · 40 questions
TalentJR

The method (LCM, then take away): Find the LCM of the two bottom numbers. Change each fraction to that bottom number. Subtract the tops, keep the bottom, and simplify.

NameDateTime takenScore ___ / 40
  1. 1.Aarav has a ribbon 4/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  2. 2.A tank is 4/5 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  3. 3.A tank is 1/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  4. 4.3/4 − 5/8 =
  5. 5.A tank is 5/6 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  6. 6.A tank is 2/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  7. 7.Kabir has a ribbon 4/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  8. 8.9/10 − 2/5 =
  9. 9.2/9 − 1/6 =
  10. 10.A tank is 4/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  11. 11.3/4 − 1/3 =
  12. 12.5/7 − 2/3 =
  13. 13.5/8 − 1/3 =
  14. 14.5/9 − 1/6 =
  15. 15.1/3 − 1/9 =
  16. 16.Sara has a ribbon 3/4 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  17. 17.A bottle has 1/2 litre of juice. Riya drinks 1/6 litre. How much juice is left (in litres)? =
  18. 18.3/5 − 1/3 =
  19. 19.5/8 − 1/4 =
  20. 20.4/5 − 3/10 =
  21. 21.1/3 − 1/8 =
  22. 22.A bottle has 1/3 litre of juice. Tara drinks 2/7 litre. How much juice is left (in litres)? =
  23. 23.5/6 − 1/9 =
  24. 24.3/5 − 1/6 =
  25. 25.4/5 − 1/10 =
  26. 26.Meera has a ribbon 2/3 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  27. 27.5/6 − 3/10 =
  28. 28.4/5 − 1/6 =
  29. 29.Ishaan has a ribbon 8/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  30. 30.8/9 − 1/6 =
  31. 31.1/5 − 1/6 =
  32. 32.2/7 − 1/4 =
  33. 33.3/4 − 2/5 =
  34. 34.2/3 − 2/7 =
  35. 35.4/9 − 1/6 =
  36. 36.A tank is 1/3 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  37. 37.Sara has a ribbon 9/10 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  38. 38.2/3 − 1/6 =
  39. 39.6/7 − 1/2 =
  40. 40.5/7 − 1/2 =

Answer key

  1. 9/28
  2. 1/2
  3. 4/21
  4. 1/8
  5. 1/12
  6. 1/15
  7. 5/18
  8. 1/2
  9. 1/18
  10. 5/21
  11. 5/12
  12. 1/21
  13. 7/24
  14. 7/18
  15. 2/9
  16. 7/12
  17. 1/3
  18. 4/15
  19. 3/8
  20. 1/2
  21. 5/24
  22. 1/21
  23. 13/18
  24. 13/30
  25. 7/10
  26. 17/30
  27. 8/15
  28. 19/30
  29. 13/18
  30. 13/18
  31. 1/30
  32. 1/28
  33. 7/20
  34. 8/21
  35. 5/18
  36. 1/30
  37. 13/20
  38. 1/2
  39. 5/14
  40. 3/14

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