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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 198 · 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. 1.4/7 − 1/3 =
  2. 2.Aarav has a ribbon 1/6 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  3. 3.Aarav has a ribbon 1/3 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  4. 4.Riya has a ribbon 5/6 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  5. 5.8/9 − 1/2 =
  6. 6.A tank is 1/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  7. 7.A bottle has 3/5 litre of juice. Tara drinks 1/6 litre. How much juice is left (in litres)? =
  8. 8.A bottle has 3/4 litre of juice. Meera drinks 3/10 litre. How much juice is left (in litres)? =
  9. 9.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? =
  10. 10.A tank is 7/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  11. 11.2/3 − 1/10 =
  12. 12.2/9 − 1/6 =
  13. 13.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? =
  14. 14.3/4 − 4/7 =
  15. 15.A tank is 6/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  16. 16.3/4 − 3/8 =
  17. 17.1/2 − 2/5 =
  18. 18.A tank is 2/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  19. 19.2/5 − 1/10 =
  20. 20.2/3 − 5/9 =
  21. 21.A bottle has 1/6 litre of juice. Rohan drinks 1/10 litre. How much juice is left (in litres)? =
  22. 22.A bottle has 1/3 litre of juice. Rohan drinks 1/6 litre. How much juice is left (in litres)? =
  23. 23.A bottle has 1/2 litre of juice. Ishaan drinks 2/7 litre. How much juice is left (in litres)? =
  24. 24.Rohan has a ribbon 3/5 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  25. 25.Rohan has a ribbon 8/9 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  26. 26.5/7 − 1/3 =
  27. 27.8/9 − 2/3 =
  28. 28.Aarav has a ribbon 5/6 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  29. 29.Riya has a ribbon 9/10 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  30. 30.5/6 − 7/10 =
  31. 31.4/5 − 3/10 =
  32. 32.7/8 − 1/2 =
  33. 33.7/9 − 1/3 =
  34. 34.7/10 − 2/3 =
  35. 35.A bottle has 3/7 litre of juice. Meera drinks 1/4 litre. How much juice is left (in litres)? =
  36. 36.A tank is 2/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  37. 37.1/5 − 1/10 =
  38. 38.1/3 − 1/8 =
  39. 39.7/10 − 1/4 =
  40. 40.1/3 − 2/7 =

Answer key

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

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