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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 604 · 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.A tank is 1/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  2. 2.A tank is 1/2 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  3. 3.Aarav has a ribbon 5/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  4. 4.2/3 − 2/9 =
  5. 5.3/8 − 1/6 =
  6. 6.A bottle has 1/6 litre of juice. Sara drinks 1/8 litre. How much juice is left (in litres)? =
  7. 7.Rohan has a ribbon 4/5 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  8. 8.7/8 − 1/2 =
  9. 9.6/7 − 3/4 =
  10. 10.1/4 − 1/8 =
  11. 11.A bottle has 3/5 litre of juice. Riya drinks 1/4 litre. How much juice is left (in litres)? =
  12. 12.3/4 − 5/7 =
  13. 13.A bottle has 1/2 litre of juice. Riya drinks 2/7 litre. How much juice is left (in litres)? =
  14. 14.A tank is 3/4 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  15. 15.A bottle has 5/9 litre of juice. Kabir drinks 1/2 litre. How much juice is left (in litres)? =
  16. 16.2/3 − 2/7 =
  17. 17.1/3 − 2/9 =
  18. 18.A tank is 1/2 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  19. 19.1/2 − 1/9 =
  20. 20.5/7 − 1/4 =
  21. 21.A bottle has 5/7 litre of juice. Meera drinks 1/2 litre. How much juice is left (in litres)? =
  22. 22.6/7 − 1/4 =
  23. 23.3/7 − 1/4 =
  24. 24.A tank is 3/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  25. 25.3/4 − 2/7 =
  26. 26.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? =
  27. 27.2/7 − 1/4 =
  28. 28.A tank is 9/10 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  29. 29.Rohan has a ribbon 4/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  30. 30.5/9 − 1/3 =
  31. 31.3/7 − 1/3 =
  32. 32.9/10 − 1/3 =
  33. 33.A bottle has 8/9 litre of juice. Diya drinks 1/2 litre. How much juice is left (in litres)? =
  34. 34.A tank is 1/2 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  35. 35.2/9 − 1/6 =
  36. 36.7/9 − 1/3 =
  37. 37.8/9 − 2/3 =
  38. 38.A bottle has 1/4 litre of juice. Tara drinks 1/7 litre. How much juice is left (in litres)? =
  39. 39.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? =
  40. 40.3/4 − 4/7 =

Answer key

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

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