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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 922 · 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 1/3 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  2. 2.5/6 − 4/5 =
  3. 3.A tank is 5/6 full of water. Then water filling 7/9 of the tank is used. What fraction of the tank is full now? =
  4. 4.A bottle has 7/8 litre of juice. Aarav drinks 1/6 litre. How much juice is left (in litres)? =
  5. 5.2/5 − 1/4 =
  6. 6.3/8 − 1/6 =
  7. 7.Diya has a ribbon 4/5 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  8. 8.1/3 − 1/8 =
  9. 9.Diya has a ribbon 5/6 m long and cuts off 7/9 m. How long is the ribbon now (in m)? =
  10. 10.Riya has a ribbon 3/8 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  11. 11.5/6 − 2/9 =
  12. 12.8/9 − 2/3 =
  13. 13.A tank is 4/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  14. 14.Arjun has a ribbon 5/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  15. 15.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? =
  16. 16.A bottle has 5/7 litre of juice. Riya drinks 1/3 litre. How much juice is left (in litres)? =
  17. 17.1/3 − 1/10 =
  18. 18.Kabir has a ribbon 2/3 m long and cuts off 3/7 m. How long is the ribbon now (in m)? =
  19. 19.6/7 − 1/4 =
  20. 20.7/10 − 1/4 =
  21. 21.Arjun has a ribbon 7/8 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  22. 22.4/5 − 7/10 =
  23. 23.3/4 − 5/8 =
  24. 24.2/3 − 5/9 =
  25. 25.1/2 − 4/9 =
  26. 26.A bottle has 2/3 litre of juice. Sara drinks 2/5 litre. How much juice is left (in litres)? =
  27. 27.1/2 − 1/6 =
  28. 28.5/7 − 1/4 =
  29. 29.7/10 − 1/5 =
  30. 30.3/4 − 3/8 =
  31. 31.3/5 − 1/6 =
  32. 32.5/6 − 3/4 =
  33. 33.A bottle has 4/5 litre of juice. Tara drinks 1/2 litre. How much juice is left (in litres)? =
  34. 34.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? =
  35. 35.A tank is 5/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  36. 36.7/9 − 1/2 =
  37. 37.A tank is 6/7 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  38. 38.A tank is 4/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  39. 39.6/7 − 3/4 =
  40. 40.2/3 − 2/7 =

Answer key

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

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