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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 537 · 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 − 2/7 =
  2. 2.A tank is 8/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  3. 3.A tank is 8/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  4. 4.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? =
  5. 5.1/2 − 1/9 =
  6. 6.A tank is 3/4 full of water. Then water filling 5/8 of the tank is used. What fraction of the tank is full now? =
  7. 7.Kabir has a ribbon 7/8 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  8. 8.3/4 − 3/7 =
  9. 9.Sara has a ribbon 9/10 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  10. 10.4/5 − 3/4 =
  11. 11.1/2 − 1/8 =
  12. 12.1/2 − 1/6 =
  13. 13.5/8 − 1/6 =
  14. 14.6/7 − 1/4 =
  15. 15.1/6 − 1/9 =
  16. 16.A bottle has 7/10 litre of juice. Aarav drinks 1/5 litre. How much juice is left (in litres)? =
  17. 17.A tank is 1/5 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  18. 18.A tank is 2/3 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  19. 19.A tank is 7/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  20. 20.A tank is 3/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  21. 21.5/6 − 2/9 =
  22. 22.Kabir has a ribbon 5/6 m long and cuts off 4/5 m. How long is the ribbon now (in m)? =
  23. 23.2/3 − 3/10 =
  24. 24.3/4 − 3/8 =
  25. 25.Diya has a ribbon 2/3 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =
  26. 26.A bottle has 7/8 litre of juice. Aarav drinks 3/4 litre. How much juice is left (in litres)? =
  27. 27.2/3 − 1/7 =
  28. 28.Rohan has a ribbon 5/6 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  29. 29.5/8 − 1/2 =
  30. 30.3/5 − 1/2 =
  31. 31.Vihaan has a ribbon 2/3 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  32. 32.3/7 − 1/3 =
  33. 33.A bottle has 3/5 litre of juice. Meera drinks 1/3 litre. How much juice is left (in litres)? =
  34. 34.8/9 − 1/3 =
  35. 35.A tank is 4/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  36. 36.Rohan has a ribbon 3/4 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  37. 37.2/3 − 4/7 =
  38. 38.1/5 − 1/6 =
  39. 39.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? =
  40. 40.A bottle has 2/3 litre of juice. Diya drinks 1/4 litre. How much juice is left (in litres)? =

Answer key

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

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