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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 143 · 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. 1.7/8 − 3/4 =
  2. 2.1/3 − 1/10 =
  3. 3.7/9 − 1/3 =
  4. 4.7/10 − 2/3 =
  5. 5.5/6 − 5/9 =
  6. 6.A tank is 1/2 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  7. 7.A tank is 1/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  8. 8.Sara has a ribbon 7/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  9. 9.1/5 − 1/10 =
  10. 10.A tank is 1/2 full of water. Then water filling 4/9 of the tank is used. What fraction of the tank is full now? =
  11. 11.2/3 − 4/9 =
  12. 12.6/7 − 1/3 =
  13. 13.A tank is 5/6 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  14. 14.A bottle has 3/8 litre of juice. Rohan drinks 1/3 litre. How much juice is left (in litres)? =
  15. 15.Aarav has a ribbon 2/3 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  16. 16.A bottle has 1/3 litre of juice. Tara drinks 2/7 litre. How much juice is left (in litres)? =
  17. 17.A bottle has 2/3 litre of juice. Riya drinks 5/9 litre. How much juice is left (in litres)? =
  18. 18.2/5 − 1/4 =
  19. 19.6/7 − 3/4 =
  20. 20.Meera has a ribbon 6/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  21. 21.1/3 − 1/8 =
  22. 22.A tank is 1/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  23. 23.A tank is 7/8 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  24. 24.9/10 − 1/5 =
  25. 25.A tank is 3/4 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  26. 26.9/10 − 3/4 =
  27. 27.Rohan has a ribbon 4/5 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  28. 28.A bottle has 8/9 litre of juice. Ishaan drinks 1/2 litre. How much juice is left (in litres)? =
  29. 29.Tara has a ribbon 5/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  30. 30.Aarav has a ribbon 2/5 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  31. 31.Anaya has a ribbon 1/4 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  32. 32.Tara has a ribbon 4/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  33. 33.A tank is 2/3 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  34. 34.5/9 − 1/3 =
  35. 35.1/2 − 1/9 =
  36. 36.Meera has a ribbon 1/4 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  37. 37.A tank is 2/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  38. 38.Aarav has a ribbon 1/2 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  39. 39.A bottle has 2/3 litre of juice. Riya drinks 1/2 litre. How much juice is left (in litres)? =
  40. 40.A bottle has 2/3 litre of juice. Diya drinks 2/9 litre. How much juice is left (in litres)? =

Answer key

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

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