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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 909 · 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 2/3 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  2. 2.A tank is 4/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  3. 3.Vihaan has a ribbon 2/3 m long and cuts off 3/7 m. How long is the ribbon now (in m)? =
  4. 4.A bottle has 1/2 litre of juice. Arjun drinks 3/8 litre. How much juice is left (in litres)? =
  5. 5.Ishaan has a ribbon 4/5 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  6. 6.7/8 − 5/6 =
  7. 7.8/9 − 1/2 =
  8. 8.5/7 − 1/3 =
  9. 9.Aarav has a ribbon 3/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  10. 10.A bottle has 2/5 litre of juice. Diya drinks 1/4 litre. How much juice is left (in litres)? =
  11. 11.4/5 − 1/6 =
  12. 12.Diya has a ribbon 3/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  13. 13.Ishaan has a ribbon 3/4 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  14. 14.A bottle has 2/3 litre of juice. Arjun drinks 1/10 litre. How much juice is left (in litres)? =
  15. 15.Riya has a ribbon 2/3 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  16. 16.Tara has a ribbon 3/4 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  17. 17.1/6 − 1/8 =
  18. 18.2/5 − 1/6 =
  19. 19.A bottle has 7/10 litre of juice. Diya drinks 1/3 litre. How much juice is left (in litres)? =
  20. 20.4/5 − 1/2 =
  21. 21.3/7 − 1/3 =
  22. 22.7/10 − 2/3 =
  23. 23.1/2 − 1/9 =
  24. 24.1/2 − 1/7 =
  25. 25.2/3 − 3/5 =
  26. 26.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? =
  27. 27.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? =
  28. 28.A tank is 4/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  29. 29.7/8 − 2/3 =
  30. 30.A bottle has 5/7 litre of juice. Tara drinks 2/3 litre. How much juice is left (in litres)? =
  31. 31.1/2 − 1/4 =
  32. 32.A bottle has 1/2 litre of juice. Kabir drinks 1/6 litre. How much juice is left (in litres)? =
  33. 33.5/7 − 1/2 =
  34. 34.5/6 − 1/8 =
  35. 35.Riya has a ribbon 5/6 m long and cuts off 4/5 m. How long is the ribbon now (in m)? =
  36. 36.A tank is 1/2 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  37. 37.2/3 − 5/9 =
  38. 38.Arjun has a ribbon 1/5 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  39. 39.3/4 − 1/5 =
  40. 40.A tank is 8/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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