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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 779 · 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 1/2 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  2. 2.5/7 − 1/2 =
  3. 3.5/7 − 1/4 =
  4. 4.2/3 − 1/7 =
  5. 5.8/9 − 5/6 =
  6. 6.A bottle has 1/2 litre of juice. Arjun drinks 3/7 litre. How much juice is left (in litres)? =
  7. 7.2/3 − 2/7 =
  8. 8.A bottle has 5/6 litre of juice. Ishaan drinks 1/3 litre. How much juice is left (in litres)? =
  9. 9.1/2 − 4/9 =
  10. 10.3/4 − 1/2 =
  11. 11.8/9 − 1/3 =
  12. 12.A tank is 3/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  13. 13.A tank is 5/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  14. 14.7/9 − 1/3 =
  15. 15.4/5 − 3/10 =
  16. 16.A bottle has 1/2 litre of juice. Anaya drinks 4/9 litre. How much juice is left (in litres)? =
  17. 17.A tank is 2/3 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  18. 18.7/8 − 1/3 =
  19. 19.Diya has a ribbon 4/5 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  20. 20.Arjun has a ribbon 2/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  21. 21.3/8 − 1/3 =
  22. 22.A tank is 3/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  23. 23.A bottle has 3/4 litre of juice. Kabir drinks 5/8 litre. How much juice is left (in litres)? =
  24. 24.Kabir has a ribbon 2/3 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  25. 25.A bottle has 2/3 litre of juice. Rohan drinks 3/5 litre. How much juice is left (in litres)? =
  26. 26.A tank is 1/3 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  27. 27.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? =
  28. 28.A tank is 4/5 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  29. 29.A bottle has 1/4 litre of juice. Vihaan drinks 1/5 litre. How much juice is left (in litres)? =
  30. 30.3/4 − 5/7 =
  31. 31.3/5 − 1/3 =
  32. 32.Riya has a ribbon 1/2 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  33. 33.5/6 − 3/5 =
  34. 34.A tank is 9/10 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  35. 35.2/7 − 1/4 =
  36. 36.A bottle has 1/4 litre of juice. Aarav drinks 1/7 litre. How much juice is left (in litres)? =
  37. 37.3/4 − 1/6 =
  38. 38.A bottle has 5/8 litre of juice. Kabir drinks 1/3 litre. How much juice is left (in litres)? =
  39. 39.A bottle has 7/8 litre of juice. Sara drinks 5/6 litre. How much juice is left (in litres)? =
  40. 40.A bottle has 5/8 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =

Answer key

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

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