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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 390 · 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. 1.2/3 − 1/5 =
  2. 2.A tank is 3/8 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  3. 3.1/2 − 1/9 =
  4. 4.6/7 − 1/2 =
  5. 5.Ishaan has a ribbon 9/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  6. 6.A bottle has 1/6 litre of juice. Diya drinks 1/10 litre. How much juice is left (in litres)? =
  7. 7.A bottle has 1/4 litre of juice. Rohan drinks 1/8 litre. How much juice is left (in litres)? =
  8. 8.A bottle has 4/5 litre of juice. Aarav drinks 3/10 litre. How much juice is left (in litres)? =
  9. 9.A bottle has 6/7 litre of juice. Kabir drinks 3/4 litre. How much juice is left (in litres)? =
  10. 10.7/9 − 2/3 =
  11. 11.1/2 − 3/8 =
  12. 12.Diya has a ribbon 2/3 m long and cuts off 3/7 m. How long is the ribbon now (in m)? =
  13. 13.Ishaan has a ribbon 7/8 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  14. 14.A tank is 1/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  15. 15.Meera has a ribbon 2/3 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  16. 16.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? =
  17. 17.A tank is 3/4 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  18. 18.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? =
  19. 19.1/2 − 1/7 =
  20. 20.1/5 − 1/6 =
  21. 21.7/8 − 5/6 =
  22. 22.Kabir has a ribbon 4/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  23. 23.2/3 − 5/8 =
  24. 24.8/9 − 1/3 =
  25. 25.A bottle has 3/4 litre of juice. Kabir drinks 1/5 litre. How much juice is left (in litres)? =
  26. 26.A tank is 4/5 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  27. 27.3/5 − 1/4 =
  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. 29.9/10 − 2/5 =
  30. 30.A tank is 1/3 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  31. 31.3/7 − 1/3 =
  32. 32.A tank is 1/6 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  33. 33.A tank is 5/8 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  34. 34.4/5 − 7/10 =
  35. 35.A tank is 5/6 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  36. 36.Kabir has a ribbon 3/4 m long and cuts off 4/7 m. How long is the ribbon now (in m)? =
  37. 37.8/9 − 2/3 =
  38. 38.3/4 − 2/3 =
  39. 39.Riya has a ribbon 6/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  40. 40.A tank is 7/8 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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