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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 783 · 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 1/9 of the tank is used. What fraction of the tank is full now? =
  2. 2.Meera has a ribbon 9/10 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  3. 3.3/4 − 1/7 =
  4. 4.Anaya has a ribbon 5/6 m long and cuts off 3/4 m. How long is the ribbon now (in m)? =
  5. 5.A tank is 3/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  6. 6.A tank is 7/10 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  7. 7.1/4 − 1/7 =
  8. 8.5/9 − 1/2 =
  9. 9.7/10 − 1/4 =
  10. 10.A tank is 3/4 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  11. 11.1/3 − 3/10 =
  12. 12.7/9 − 1/2 =
  13. 13.2/5 − 1/4 =
  14. 14.1/2 − 1/9 =
  15. 15.Sara has a ribbon 7/8 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  16. 16.4/5 − 3/10 =
  17. 17.Riya has a ribbon 1/2 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =
  18. 18.A tank is 5/6 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  19. 19.5/7 − 1/4 =
  20. 20.Rohan has a ribbon 2/3 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  21. 21.6/7 − 3/4 =
  22. 22.5/7 − 1/2 =
  23. 23.1/2 − 2/7 =
  24. 24.Kabir has a ribbon 3/4 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  25. 25.A bottle has 4/5 litre of juice. Aarav drinks 3/10 litre. How much juice is left (in litres)? =
  26. 26.1/4 − 1/8 =
  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.Diya has a ribbon 5/8 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  29. 29.9/10 − 1/6 =
  30. 30.7/10 − 3/5 =
  31. 31.A tank is 7/10 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  32. 32.3/7 − 1/4 =
  33. 33.1/2 − 2/5 =
  34. 34.A tank is 5/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  35. 35.A bottle has 1/5 litre of juice. Kabir drinks 1/10 litre. How much juice is left (in litres)? =
  36. 36.5/6 − 1/5 =
  37. 37.A bottle has 1/2 litre of juice. Meera drinks 2/7 litre. How much juice is left (in litres)? =
  38. 38.6/7 − 2/3 =
  39. 39.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? =
  40. 40.A tank is 3/4 full of water. Then water filling 7/10 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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