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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 438 · 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 1/7 of the tank is used. What fraction of the tank is full now? =
  2. 2.A bottle has 1/4 litre of juice. Sara drinks 1/5 litre. How much juice is left (in litres)? =
  3. 3.A tank is 5/8 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  4. 4.A bottle has 6/7 litre of juice. Aarav drinks 1/3 litre. How much juice is left (in litres)? =
  5. 5.3/5 − 3/10 =
  6. 6.5/7 − 1/3 =
  7. 7.A bottle has 7/8 litre of juice. Tara drinks 3/4 litre. How much juice is left (in litres)? =
  8. 8.2/3 − 1/4 =
  9. 9.Sara has a ribbon 3/4 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  10. 10.4/7 − 1/2 =
  11. 11.A tank is 2/3 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  12. 12.5/7 − 1/2 =
  13. 13.A bottle has 1/2 litre of juice. Kabir drinks 1/7 litre. How much juice is left (in litres)? =
  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. 15.1/2 − 3/10 =
  16. 16.A tank is 5/8 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  17. 17.1/3 − 1/7 =
  18. 18.Kabir has a ribbon 3/4 m long and cuts off 5/7 m. How long is the ribbon now (in m)? =
  19. 19.A bottle has 2/3 litre of juice. Ishaan drinks 2/9 litre. How much juice is left (in litres)? =
  20. 20.A tank is 5/6 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  21. 21.7/9 − 1/2 =
  22. 22.A tank is 5/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  23. 23.7/9 − 1/6 =
  24. 24.A tank is 3/4 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  25. 25.A tank is 6/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  26. 26.5/8 − 1/3 =
  27. 27.5/6 − 2/9 =
  28. 28.A bottle has 1/4 litre of juice. Anaya drinks 1/7 litre. How much juice is left (in litres)? =
  29. 29.A tank is 2/3 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  30. 30.A bottle has 3/5 litre of juice. Sara drinks 1/6 litre. How much juice is left (in litres)? =
  31. 31.Riya has a ribbon 9/10 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  32. 32.2/7 − 1/4 =
  33. 33.2/3 − 5/8 =
  34. 34.5/9 − 1/6 =
  35. 35.1/2 − 1/9 =
  36. 36.Diya has a ribbon 4/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  37. 37.5/9 − 1/2 =
  38. 38.Kabir has a ribbon 9/10 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  39. 39.4/5 − 2/3 =
  40. 40.A bottle has 4/5 litre of juice. Ishaan drinks 3/10 litre. How much juice is left (in litres)? =

Answer key

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

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