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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 343 · 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. 1.3/7 − 1/3 =
  2. 2.A tank is 1/4 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  3. 3.2/3 − 4/9 =
  4. 4.6/7 − 1/2 =
  5. 5.2/5 − 1/4 =
  6. 6.4/9 − 1/3 =
  7. 7.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? =
  8. 8.4/7 − 1/2 =
  9. 9.1/3 − 3/10 =
  10. 10.5/8 − 1/2 =
  11. 11.4/5 − 3/10 =
  12. 12.3/10 − 1/4 =
  13. 13.2/3 − 3/8 =
  14. 14.4/5 − 1/10 =
  15. 15.9/10 − 4/5 =
  16. 16.5/7 − 1/4 =
  17. 17.Diya has a ribbon 7/10 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  18. 18.A tank is 5/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  19. 19.9/10 − 3/5 =
  20. 20.7/9 − 1/3 =
  21. 21.3/8 − 1/4 =
  22. 22.2/3 − 3/7 =
  23. 23.A bottle has 4/5 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =
  24. 24.Arjun has a ribbon 7/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  25. 25.1/6 − 1/9 =
  26. 26.A tank is 5/6 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  27. 27.5/6 − 3/10 =
  28. 28.3/4 − 1/3 =
  29. 29.2/5 − 1/10 =
  30. 30.Meera has a ribbon 7/10 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  31. 31.Meera has a ribbon 1/3 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  32. 32.Rohan has a ribbon 8/9 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  33. 33.Rohan has a ribbon 1/3 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  34. 34.Rohan has a ribbon 9/10 m long and cuts off 4/5 m. How long is the ribbon now (in m)? =
  35. 35.1/3 − 1/10 =
  36. 36.A bottle has 7/10 litre of juice. Rohan drinks 3/5 litre. How much juice is left (in litres)? =
  37. 37.Arjun has a ribbon 7/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  38. 38.3/4 − 2/3 =
  39. 39.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? =
  40. 40.Anaya has a ribbon 7/8 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =

Answer key

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

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