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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 29 · 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. 1.8/9 − 1/2 =
  2. 2.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? =
  3. 3.A tank is 1/3 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  4. 4.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? =
  5. 5.A tank is 2/3 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  6. 6.A tank is 1/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  7. 7.3/4 − 3/8 =
  8. 8.A bottle has 7/10 litre of juice. Anaya drinks 1/6 litre. How much juice is left (in litres)? =
  9. 9.3/5 − 1/10 =
  10. 10.A tank is 3/4 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  11. 11.3/8 − 1/4 =
  12. 12.A bottle has 8/9 litre of juice. Sara drinks 1/2 litre. How much juice is left (in litres)? =
  13. 13.A bottle has 2/3 litre of juice. Vihaan drinks 1/5 litre. How much juice is left (in litres)? =
  14. 14.Rohan has a ribbon 6/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  15. 15.Arjun has a ribbon 6/7 m long and cuts off 3/4 m. How long is the ribbon now (in m)? =
  16. 16.4/7 − 1/4 =
  17. 17.3/4 − 5/7 =
  18. 18.5/6 − 3/5 =
  19. 19.A bottle has 3/4 litre of juice. Arjun drinks 5/7 litre. How much juice is left (in litres)? =
  20. 20.A bottle has 5/8 litre of juice. Meera drinks 1/4 litre. How much juice is left (in litres)? =
  21. 21.A bottle has 1/2 litre of juice. Sara drinks 2/7 litre. How much juice is left (in litres)? =
  22. 22.Rohan has a ribbon 3/5 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  23. 23.8/9 − 2/3 =
  24. 24.A bottle has 5/9 litre of juice. Aarav drinks 1/2 litre. How much juice is left (in litres)? =
  25. 25.Diya has a ribbon 1/3 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  26. 26.A bottle has 2/3 litre of juice. Diya drinks 4/9 litre. How much juice is left (in litres)? =
  27. 27.A tank is 7/10 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  28. 28.1/4 − 1/10 =
  29. 29.3/7 − 1/4 =
  30. 30.2/5 − 1/10 =
  31. 31.A tank is 9/10 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  32. 32.4/9 − 1/6 =
  33. 33.Tara has a ribbon 5/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  34. 34.Ishaan has a ribbon 7/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  35. 35.A bottle has 3/7 litre of juice. Vihaan drinks 1/4 litre. How much juice is left (in litres)? =
  36. 36.3/4 − 5/8 =
  37. 37.A tank is 9/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  38. 38.9/10 − 1/5 =
  39. 39.A tank is 1/3 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  40. 40.A tank is 1/6 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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