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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 244 · 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 1/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  2. 2.5/7 − 1/4 =
  3. 3.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? =
  4. 4.4/5 − 2/3 =
  5. 5.A bottle has 3/8 litre of juice. Meera drinks 1/4 litre. How much juice is left (in litres)? =
  6. 6.Aarav has a ribbon 3/4 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  7. 7.2/3 − 2/9 =
  8. 8.A tank is 9/10 full of water. Then water filling 4/5 of the tank is used. What fraction of the tank is full now? =
  9. 9.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? =
  10. 10.A tank is 2/3 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  11. 11.8/9 − 1/3 =
  12. 12.Diya has a ribbon 2/5 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  13. 13.Kabir has a ribbon 3/4 m long and cuts off 4/7 m. How long is the ribbon now (in m)? =
  14. 14.A bottle has 3/4 litre of juice. Ishaan drinks 3/7 litre. How much juice is left (in litres)? =
  15. 15.7/9 − 1/3 =
  16. 16.9/10 − 4/5 =
  17. 17.6/7 − 1/3 =
  18. 18.7/10 − 1/4 =
  19. 19.Rohan has a ribbon 1/2 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  20. 20.Kabir has a ribbon 1/3 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  21. 21.Aarav has a ribbon 1/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  22. 22.7/8 − 3/4 =
  23. 23.4/7 − 1/4 =
  24. 24.3/4 − 3/5 =
  25. 25.Sara has a ribbon 3/4 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  26. 26.5/6 − 7/9 =
  27. 27.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? =
  28. 28.3/7 − 1/4 =
  29. 29.8/9 − 5/6 =
  30. 30.4/7 − 1/2 =
  31. 31.A bottle has 4/7 litre of juice. Tara drinks 1/2 litre. How much juice is left (in litres)? =
  32. 32.1/2 − 1/10 =
  33. 33.9/10 − 1/6 =
  34. 34.Rohan has a ribbon 3/4 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  35. 35.A tank is 1/2 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  36. 36.5/9 − 1/3 =
  37. 37.2/7 − 1/4 =
  38. 38.1/2 − 2/9 =
  39. 39.A tank is 5/6 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  40. 40.3/4 − 1/5 =

Answer key

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

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