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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 70 · 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.A tank is 4/5 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  2. 2.1/3 − 1/10 =
  3. 3.2/5 − 3/10 =
  4. 4.9/10 − 2/3 =
  5. 5.2/3 − 1/7 =
  6. 6.A tank is 3/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  7. 7.A tank is 3/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  8. 8.5/7 − 1/3 =
  9. 9.7/8 − 1/4 =
  10. 10.1/2 − 1/6 =
  11. 11.9/10 − 3/5 =
  12. 12.Meera has a ribbon 8/9 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  13. 13.5/6 − 1/9 =
  14. 14.1/2 − 3/8 =
  15. 15.A bottle has 5/6 litre of juice. Ishaan drinks 2/9 litre. How much juice is left (in litres)? =
  16. 16.8/9 − 1/6 =
  17. 17.A tank is 2/3 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  18. 18.3/4 − 3/5 =
  19. 19.A bottle has 2/3 litre of juice. Kabir drinks 4/7 litre. How much juice is left (in litres)? =
  20. 20.3/4 − 1/10 =
  21. 21.Aarav has a ribbon 3/4 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  22. 22.Tara has a ribbon 2/3 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  23. 23.1/3 − 2/7 =
  24. 24.A tank is 1/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  25. 25.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? =
  26. 26.3/4 − 4/7 =
  27. 27.A bottle has 3/10 litre of juice. Ishaan drinks 1/5 litre. How much juice is left (in litres)? =
  28. 28.2/3 − 2/5 =
  29. 29.Anaya has a ribbon 3/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  30. 30.2/3 − 4/9 =
  31. 31.5/8 − 1/3 =
  32. 32.7/10 − 2/3 =
  33. 33.A tank is 3/4 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  34. 34.4/9 − 1/6 =
  35. 35.Riya has a ribbon 5/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  36. 36.Arjun has a ribbon 7/8 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  37. 37.A bottle has 3/4 litre of juice. Rohan drinks 1/5 litre. How much juice is left (in litres)? =
  38. 38.3/4 − 1/5 =
  39. 39.Aarav has a ribbon 4/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  40. 40.2/3 − 2/7 =

Answer key

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

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