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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 240 · 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. 1.2/3 − 3/8 =
  2. 2.7/8 − 3/4 =
  3. 3.3/7 − 1/4 =
  4. 4.A bottle has 5/8 litre of juice. Rohan drinks 1/4 litre. How much juice is left (in litres)? =
  5. 5.Sara has a ribbon 3/4 m long and cuts off 5/7 m. How long is the ribbon now (in m)? =
  6. 6.5/6 − 1/3 =
  7. 7.A tank is 5/7 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  8. 8.Rohan has a ribbon 3/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  9. 9.6/7 − 1/3 =
  10. 10.9/10 − 2/5 =
  11. 11.A tank is 6/7 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  12. 12.A tank is 9/10 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  13. 13.7/9 − 2/3 =
  14. 14.A tank is 5/8 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  15. 15.Sara has a ribbon 3/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  16. 16.Diya has a ribbon 4/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  17. 17.A bottle has 1/5 litre of juice. Meera drinks 1/10 litre. How much juice is left (in litres)? =
  18. 18.A bottle has 1/5 litre of juice. Arjun drinks 1/6 litre. How much juice is left (in litres)? =
  19. 19.Vihaan has a ribbon 1/4 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  20. 20.7/9 − 1/2 =
  21. 21.1/3 − 2/9 =
  22. 22.Aarav has a ribbon 5/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  23. 23.2/3 − 3/10 =
  24. 24.A bottle has 3/4 litre of juice. Ishaan drinks 3/10 litre. How much juice is left (in litres)? =
  25. 25.7/8 − 1/2 =
  26. 26.2/3 − 1/4 =
  27. 27.2/3 − 1/8 =
  28. 28.1/3 − 1/7 =
  29. 29.5/7 − 1/3 =
  30. 30.A bottle has 2/7 litre of juice. Rohan drinks 1/4 litre. How much juice is left (in litres)? =
  31. 31.A tank is 2/3 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  32. 32.4/5 − 2/3 =
  33. 33.8/9 − 2/3 =
  34. 34.1/4 − 1/5 =
  35. 35.Diya has a ribbon 1/2 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =
  36. 36.2/3 − 2/7 =
  37. 37.Kabir has a ribbon 5/6 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  38. 38.1/3 − 1/5 =
  39. 39.A bottle has 4/7 litre of juice. Tara drinks 1/4 litre. How much juice is left (in litres)? =
  40. 40.1/2 − 4/9 =

Answer key

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

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