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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 451 · 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. 1.3/5 − 1/2 =
  2. 2.2/5 − 1/3 =
  3. 3.A bottle has 3/5 litre of juice. Diya drinks 1/3 litre. How much juice is left (in litres)? =
  4. 4.Kabir has a ribbon 8/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  5. 5.3/8 − 1/4 =
  6. 6.A tank is 4/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  7. 7.A bottle has 2/3 litre of juice. Ishaan drinks 3/7 litre. How much juice is left (in litres)? =
  8. 8.6/7 − 1/3 =
  9. 9.2/3 − 1/9 =
  10. 10.A bottle has 4/7 litre of juice. Ishaan drinks 1/2 litre. How much juice is left (in litres)? =
  11. 11.A bottle has 7/9 litre of juice. Meera drinks 1/3 litre. How much juice is left (in litres)? =
  12. 12.2/3 − 1/7 =
  13. 13.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? =
  14. 14.A bottle has 4/7 litre of juice. Rohan drinks 1/3 litre. How much juice is left (in litres)? =
  15. 15.2/3 − 4/7 =
  16. 16.Rohan has a ribbon 1/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  17. 17.A bottle has 3/7 litre of juice. Kabir drinks 1/3 litre. How much juice is left (in litres)? =
  18. 18.Sara has a ribbon 3/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  19. 19.3/5 − 1/6 =
  20. 20.A tank is 3/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  21. 21.A tank is 7/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  22. 22.A bottle has 3/4 litre of juice. Diya drinks 3/8 litre. How much juice is left (in litres)? =
  23. 23.2/3 − 2/7 =
  24. 24.5/8 − 1/6 =
  25. 25.A bottle has 1/4 litre of juice. Tara drinks 1/7 litre. How much juice is left (in litres)? =
  26. 26.3/4 − 1/2 =
  27. 27.4/5 − 2/3 =
  28. 28.1/5 − 1/6 =
  29. 29.4/7 − 1/3 =
  30. 30.Ishaan has a ribbon 2/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  31. 31.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? =
  32. 32.2/3 − 3/8 =
  33. 33.3/10 − 1/4 =
  34. 34.2/3 − 4/9 =
  35. 35.A bottle has 4/5 litre of juice. Arjun drinks 1/3 litre. How much juice is left (in litres)? =
  36. 36.3/4 − 2/7 =
  37. 37.2/9 − 1/6 =
  38. 38.Tara has a ribbon 5/6 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  39. 39.2/5 − 3/10 =
  40. 40.Sara has a ribbon 3/4 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =

Answer key

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

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