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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 373 · 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. 1.4/9 − 1/3 =
  2. 2.4/5 − 3/4 =
  3. 3.A tank is 1/3 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  4. 4.Rohan has a ribbon 3/10 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  5. 5.5/7 − 2/3 =
  6. 6.1/2 − 1/5 =
  7. 7.1/5 − 1/10 =
  8. 8.A bottle has 9/10 litre of juice. Riya drinks 5/6 litre. How much juice is left (in litres)? =
  9. 9.5/6 − 3/10 =
  10. 10.A tank is 1/3 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  11. 11.Meera has a ribbon 5/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  12. 12.Meera has a ribbon 4/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  13. 13.4/7 − 1/3 =
  14. 14.A bottle has 9/10 litre of juice. Riya drinks 1/6 litre. How much juice is left (in litres)? =
  15. 15.5/6 − 4/5 =
  16. 16.1/2 − 1/4 =
  17. 17.3/4 − 2/7 =
  18. 18.A bottle has 1/3 litre of juice. Tara drinks 1/8 litre. How much juice is left (in litres)? =
  19. 19.5/9 − 1/2 =
  20. 20.A tank is 5/6 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  21. 21.A bottle has 2/3 litre of juice. Aarav drinks 3/8 litre. How much juice is left (in litres)? =
  22. 22.Sara has a ribbon 1/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  23. 23.7/10 − 1/5 =
  24. 24.A bottle has 5/6 litre of juice. Rohan drinks 7/9 litre. How much juice is left (in litres)? =
  25. 25.Diya has a ribbon 3/8 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  26. 26.2/3 − 1/7 =
  27. 27.9/10 − 3/4 =
  28. 28.1/3 − 1/5 =
  29. 29.5/6 − 2/5 =
  30. 30.Kabir has a ribbon 2/3 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  31. 31.9/10 − 1/5 =
  32. 32.A tank is 9/10 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  33. 33.Arjun has a ribbon 2/3 m long and cuts off 3/7 m. How long is the ribbon now (in m)? =
  34. 34.8/9 − 1/3 =
  35. 35.A bottle has 2/3 litre of juice. Meera drinks 4/7 litre. How much juice is left (in litres)? =
  36. 36.Riya has a ribbon 4/5 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  37. 37.5/8 − 1/4 =
  38. 38.A tank is 9/10 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  39. 39.1/4 − 1/5 =
  40. 40.7/10 − 1/2 =

Answer key

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

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