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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 843 · 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 5/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  2. 2.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? =
  3. 3.3/4 − 3/7 =
  4. 4.A bottle has 3/4 litre of juice. Meera drinks 1/3 litre. How much juice is left (in litres)? =
  5. 5.3/4 − 2/7 =
  6. 6.8/9 − 1/6 =
  7. 7.2/3 − 4/7 =
  8. 8.7/9 − 1/6 =
  9. 9.Arjun has a ribbon 6/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  10. 10.A bottle has 5/7 litre of juice. Meera drinks 1/3 litre. How much juice is left (in litres)? =
  11. 11.A tank is 3/8 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  12. 12.3/4 − 2/3 =
  13. 13.2/3 − 5/8 =
  14. 14.Aarav has a ribbon 1/3 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  15. 15.7/10 − 1/4 =
  16. 16.A bottle has 5/7 litre of juice. Kabir drinks 1/4 litre. How much juice is left (in litres)? =
  17. 17.A bottle has 1/2 litre of juice. Vihaan drinks 4/9 litre. How much juice is left (in litres)? =
  18. 18.2/5 − 1/10 =
  19. 19.Ishaan has a ribbon 3/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  20. 20.4/9 − 1/3 =
  21. 21.8/9 − 1/2 =
  22. 22.5/6 − 5/8 =
  23. 23.1/2 − 4/9 =
  24. 24.3/4 − 1/5 =
  25. 25.2/7 − 1/4 =
  26. 26.Kabir has a ribbon 2/3 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  27. 27.A bottle has 7/8 litre of juice. Ishaan drinks 5/6 litre. How much juice is left (in litres)? =
  28. 28.2/3 − 2/7 =
  29. 29.3/4 − 1/3 =
  30. 30.A tank is 3/5 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  31. 31.2/3 − 3/8 =
  32. 32.Rohan has a ribbon 5/6 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  33. 33.A tank is 5/6 full of water. Then water filling 5/9 of the tank is used. What fraction of the tank is full now? =
  34. 34.Arjun has a ribbon 1/2 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  35. 35.5/6 − 1/10 =
  36. 36.7/8 − 2/3 =
  37. 37.A tank is 9/10 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  38. 38.3/4 − 3/5 =
  39. 39.A tank is 5/6 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  40. 40.2/3 − 1/8 =

Answer key

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

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