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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 338 · 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 3/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  2. 2.A tank is 4/5 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  3. 3.A tank is 3/4 full of water. Then water filling 4/7 of the tank is used. What fraction of the tank is full now? =
  4. 4.A tank is 1/3 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  5. 5.1/2 − 2/5 =
  6. 6.2/3 − 2/5 =
  7. 7.1/2 − 1/8 =
  8. 8.2/3 − 2/7 =
  9. 9.6/7 − 1/2 =
  10. 10.Sara has a ribbon 1/2 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  11. 11.2/5 − 1/10 =
  12. 12.8/9 − 5/6 =
  13. 13.Meera has a ribbon 5/6 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  14. 14.Kabir has a ribbon 4/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  15. 15.1/2 − 1/9 =
  16. 16.A tank is 7/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  17. 17.3/10 − 1/5 =
  18. 18.Vihaan has a ribbon 3/5 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  19. 19.5/6 − 4/9 =
  20. 20.Diya has a ribbon 7/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  21. 21.A bottle has 4/5 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =
  22. 22.A bottle has 3/4 litre of juice. Arjun drinks 2/7 litre. How much juice is left (in litres)? =
  23. 23.8/9 − 1/2 =
  24. 24.A bottle has 7/8 litre of juice. Kabir drinks 1/3 litre. How much juice is left (in litres)? =
  25. 25.4/9 − 1/3 =
  26. 26.A bottle has 4/5 litre of juice. Sara drinks 1/2 litre. How much juice is left (in litres)? =
  27. 27.A bottle has 1/3 litre of juice. Tara drinks 2/7 litre. How much juice is left (in litres)? =
  28. 28.Kabir has a ribbon 3/8 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  29. 29.A bottle has 1/3 litre of juice. Sara drinks 1/10 litre. How much juice is left (in litres)? =
  30. 30.7/9 − 1/3 =
  31. 31.9/10 − 1/4 =
  32. 32.3/4 − 7/10 =
  33. 33.A bottle has 2/5 litre of juice. Diya drinks 3/10 litre. How much juice is left (in litres)? =
  34. 34.4/5 − 3/4 =
  35. 35.3/5 − 1/4 =
  36. 36.5/8 − 1/6 =
  37. 37.A bottle has 2/3 litre of juice. Kabir drinks 3/8 litre. How much juice is left (in litres)? =
  38. 38.A bottle has 2/5 litre of juice. Sara drinks 1/3 litre. How much juice is left (in litres)? =
  39. 39.A bottle has 1/3 litre of juice. Rohan drinks 1/9 litre. How much juice is left (in litres)? =
  40. 40.A bottle has 8/9 litre of juice. Aarav drinks 5/6 litre. How much juice is left (in litres)? =

Answer key

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

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