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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 616 · 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. 1.3/10 − 1/4 =
  2. 2.2/3 − 3/8 =
  3. 3.A tank is 2/5 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  4. 4.1/3 − 2/9 =
  5. 5.1/6 − 1/8 =
  6. 6.A tank is 5/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  7. 7.1/6 − 1/9 =
  8. 8.Kabir has a ribbon 1/2 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =
  9. 9.5/6 − 7/9 =
  10. 10.A tank is 4/5 full of water. Then water filling 7/10 of the tank is used. What fraction of the tank is full now? =
  11. 11.2/3 − 5/9 =
  12. 12.A bottle has 4/9 litre of juice. Meera drinks 1/3 litre. How much juice is left (in litres)? =
  13. 13.A tank is 8/9 full of water. Then water filling 5/6 of the tank is used. What fraction of the tank is full now? =
  14. 14.A tank is 3/4 full of water. Then water filling 5/8 of the tank is used. What fraction of the tank is full now? =
  15. 15.A tank is 2/3 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  16. 16.8/9 − 1/3 =
  17. 17.A tank is 1/2 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  18. 18.3/4 − 1/3 =
  19. 19.Ishaan has a ribbon 1/4 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  20. 20.5/8 − 1/3 =
  21. 21.3/4 − 2/5 =
  22. 22.5/7 − 1/2 =
  23. 23.Kabir has a ribbon 5/6 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  24. 24.A bottle has 6/7 litre of juice. Ishaan drinks 2/3 litre. How much juice is left (in litres)? =
  25. 25.A tank is 7/10 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  26. 26.7/8 − 1/4 =
  27. 27.1/4 − 1/5 =
  28. 28.Ishaan has a ribbon 5/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  29. 29.1/5 − 1/10 =
  30. 30.2/5 − 3/10 =
  31. 31.1/2 − 3/7 =
  32. 32.A bottle has 2/5 litre of juice. Sara drinks 3/10 litre. How much juice is left (in litres)? =
  33. 33.1/2 − 1/9 =
  34. 34.8/9 − 1/6 =
  35. 35.4/5 − 2/3 =
  36. 36.A bottle has 4/5 litre of juice. Ishaan drinks 2/3 litre. How much juice is left (in litres)? =
  37. 37.7/8 − 2/3 =
  38. 38.A bottle has 1/2 litre of juice. Riya drinks 2/9 litre. How much juice is left (in litres)? =
  39. 39.5/9 − 1/6 =
  40. 40.A bottle has 4/5 litre of juice. Ishaan drinks 3/4 litre. How much juice is left (in litres)? =

Answer key

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

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