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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 751 · 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. 1.3/4 − 7/10 =
  2. 2.2/3 − 3/8 =
  3. 3.1/3 − 1/8 =
  4. 4.A tank is 7/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  5. 5.3/4 − 3/8 =
  6. 6.1/3 − 1/5 =
  7. 7.4/5 − 3/10 =
  8. 8.3/5 − 3/10 =
  9. 9.A bottle has 8/9 litre of juice. Ishaan drinks 1/2 litre. How much juice is left (in litres)? =
  10. 10.Vihaan has a ribbon 4/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  11. 11.9/10 − 2/5 =
  12. 12.2/3 − 3/7 =
  13. 13.A bottle has 5/9 litre of juice. Meera drinks 1/6 litre. How much juice is left (in litres)? =
  14. 14.6/7 − 1/3 =
  15. 15.A bottle has 2/9 litre of juice. Tara drinks 1/6 litre. How much juice is left (in litres)? =
  16. 16.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? =
  17. 17.A tank is 1/4 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  18. 18.A tank is 6/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  19. 19.Riya has a ribbon 5/6 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  20. 20.A tank is 2/3 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  21. 21.Anaya has a ribbon 1/3 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  22. 22.8/9 − 1/6 =
  23. 23.2/3 − 4/9 =
  24. 24.2/3 − 1/10 =
  25. 25.1/6 − 1/9 =
  26. 26.2/3 − 5/9 =
  27. 27.A bottle has 6/7 litre of juice. Tara drinks 1/3 litre. How much juice is left (in litres)? =
  28. 28.A tank is 2/3 full of water. Then water filling 5/9 of the tank is used. What fraction of the tank is full now? =
  29. 29.5/9 − 1/3 =
  30. 30.A bottle has 2/5 litre of juice. Rohan drinks 1/10 litre. How much juice is left (in litres)? =
  31. 31.5/6 − 2/3 =
  32. 32.1/2 − 3/8 =
  33. 33.Vihaan has a ribbon 3/10 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  34. 34.1/3 − 1/6 =
  35. 35.Aarav has a ribbon 1/2 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  36. 36.4/5 − 7/10 =
  37. 37.Meera has a ribbon 1/2 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  38. 38.A tank is 7/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  39. 39.9/10 − 3/5 =
  40. 40.3/4 − 4/7 =

Answer key

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

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