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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 671 · 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. 1.4/7 − 1/3 =
  2. 2.3/4 − 5/8 =
  3. 3.1/2 − 3/7 =
  4. 4.3/8 − 1/3 =
  5. 5.Rohan has a ribbon 5/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  6. 6.5/6 − 1/4 =
  7. 7.A tank is 7/8 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  8. 8.A bottle has 5/6 litre of juice. Anaya drinks 4/9 litre. How much juice is left (in litres)? =
  9. 9.3/4 − 3/10 =
  10. 10.A tank is 1/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  11. 11.A tank is 3/4 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  12. 12.A tank is 1/6 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  13. 13.8/9 − 2/3 =
  14. 14.A bottle has 1/2 litre of juice. Arjun drinks 2/5 litre. How much juice is left (in litres)? =
  15. 15.Kabir has a ribbon 1/4 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  16. 16.2/3 − 3/7 =
  17. 17.Tara has a ribbon 7/10 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  18. 18.A tank is 7/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  19. 19.A bottle has 4/9 litre of juice. Rohan drinks 1/3 litre. How much juice is left (in litres)? =
  20. 20.A bottle has 3/4 litre of juice. Tara drinks 2/5 litre. How much juice is left (in litres)? =
  21. 21.1/2 − 2/9 =
  22. 22.A tank is 3/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  23. 23.2/5 − 3/10 =
  24. 24.2/3 − 1/7 =
  25. 25.Anaya has a ribbon 3/4 m long and cuts off 5/7 m. How long is the ribbon now (in m)? =
  26. 26.3/8 − 1/6 =
  27. 27.A bottle has 5/7 litre of juice. Sara drinks 1/2 litre. How much juice is left (in litres)? =
  28. 28.3/8 − 1/4 =
  29. 29.A bottle has 1/2 litre of juice. Diya drinks 2/9 litre. How much juice is left (in litres)? =
  30. 30.A bottle has 2/5 litre of juice. Arjun drinks 1/3 litre. How much juice is left (in litres)? =
  31. 31.6/7 − 1/3 =
  32. 32.2/3 − 3/5 =
  33. 33.A tank is 3/5 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  34. 34.2/3 − 1/8 =
  35. 35.Meera has a ribbon 4/5 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  36. 36.Arjun has a ribbon 5/8 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  37. 37.8/9 − 1/2 =
  38. 38.Riya has a ribbon 6/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  39. 39.A tank is 2/3 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  40. 40.1/3 − 1/9 =

Answer key

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

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