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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 71 · 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 3/4 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  2. 2.Arjun has a ribbon 4/5 m long and cuts off 7/10 m. How long is the ribbon now (in m)? =
  3. 3.5/9 − 1/6 =
  4. 4.A tank is 3/10 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  5. 5.Ishaan has a ribbon 9/10 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  6. 6.1/2 − 1/4 =
  7. 7.5/6 − 1/10 =
  8. 8.1/3 − 1/8 =
  9. 9.6/7 − 1/2 =
  10. 10.5/8 − 1/2 =
  11. 11.1/2 − 2/7 =
  12. 12.9/10 − 5/6 =
  13. 13.4/5 − 1/4 =
  14. 14.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? =
  15. 15.5/9 − 1/2 =
  16. 16.A bottle has 3/4 litre of juice. Vihaan drinks 3/5 litre. How much juice is left (in litres)? =
  17. 17.A bottle has 7/9 litre of juice. Diya drinks 1/2 litre. How much juice is left (in litres)? =
  18. 18.Vihaan has a ribbon 5/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  19. 19.A tank is 1/2 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  20. 20.A tank is 3/4 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  21. 21.3/4 − 7/10 =
  22. 22.A bottle has 1/3 litre of juice. Ishaan drinks 1/5 litre. How much juice is left (in litres)? =
  23. 23.A bottle has 9/10 litre of juice. Sara drinks 2/5 litre. How much juice is left (in litres)? =
  24. 24.4/5 − 3/10 =
  25. 25.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? =
  26. 26.A bottle has 7/9 litre of juice. Vihaan drinks 2/3 litre. How much juice is left (in litres)? =
  27. 27.7/8 − 1/3 =
  28. 28.3/5 − 1/2 =
  29. 29.A tank is 1/2 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  30. 30.Tara has a ribbon 7/10 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  31. 31.A bottle has 2/3 litre of juice. Arjun drinks 2/5 litre. How much juice is left (in litres)? =
  32. 32.1/2 − 1/9 =
  33. 33.3/4 − 3/5 =
  34. 34.A bottle has 1/2 litre of juice. Riya drinks 2/7 litre. How much juice is left (in litres)? =
  35. 35.A bottle has 5/6 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =
  36. 36.A bottle has 1/3 litre of juice. Aarav drinks 1/9 litre. How much juice is left (in litres)? =
  37. 37.3/7 − 1/3 =
  38. 38.1/2 − 1/7 =
  39. 39.A bottle has 1/2 litre of juice. Meera drinks 3/7 litre. How much juice is left (in litres)? =
  40. 40.Arjun has a ribbon 1/2 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =

Answer key

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

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