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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 178 · 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 7/8 full of water. Then water filling 5/6 of the tank is used. What fraction of the tank is full now? =
  2. 2.5/7 − 1/3 =
  3. 3.9/10 − 2/5 =
  4. 4.4/5 − 1/4 =
  5. 5.1/2 − 1/3 =
  6. 6.1/6 − 1/9 =
  7. 7.7/8 − 1/4 =
  8. 8.3/5 − 1/10 =
  9. 9.Ishaan has a ribbon 7/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  10. 10.Anaya has a ribbon 2/3 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  11. 11.5/6 − 4/9 =
  12. 12.Diya has a ribbon 1/2 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  13. 13.1/3 − 3/10 =
  14. 14.2/3 − 2/7 =
  15. 15.A bottle has 1/3 litre of juice. Rohan drinks 1/8 litre. How much juice is left (in litres)? =
  16. 16.Rohan has a ribbon 5/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  17. 17.A bottle has 7/9 litre of juice. Anaya drinks 1/3 litre. How much juice is left (in litres)? =
  18. 18.4/5 − 2/3 =
  19. 19.A bottle has 1/2 litre of juice. Anaya drinks 1/7 litre. How much juice is left (in litres)? =
  20. 20.A tank is 4/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  21. 21.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? =
  22. 22.5/6 − 1/9 =
  23. 23.8/9 − 2/3 =
  24. 24.3/4 − 3/8 =
  25. 25.Vihaan has a ribbon 3/4 m long and cuts off 4/7 m. How long is the ribbon now (in m)? =
  26. 26.8/9 − 1/6 =
  27. 27.3/5 − 1/3 =
  28. 28.3/4 − 7/10 =
  29. 29.A tank is 3/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  30. 30.Sara has a ribbon 1/2 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =
  31. 31.A tank is 9/10 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  32. 32.5/6 − 5/8 =
  33. 33.Riya has a ribbon 7/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  34. 34.Sara has a ribbon 5/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  35. 35.A bottle has 7/10 litre of juice. Riya drinks 3/5 litre. How much juice is left (in litres)? =
  36. 36.7/10 − 3/5 =
  37. 37.Tara has a ribbon 4/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  38. 38.A bottle has 3/4 litre of juice. Diya drinks 5/7 litre. How much juice is left (in litres)? =
  39. 39.3/4 − 1/10 =
  40. 40.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? =

Answer key

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

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