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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 419 · 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 − 1/7 =
  2. 2.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? =
  3. 3.Tara has a ribbon 8/9 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  4. 4.9/10 − 4/5 =
  5. 5.5/6 − 2/9 =
  6. 6.3/4 − 3/8 =
  7. 7.3/4 − 2/5 =
  8. 8.9/10 − 1/3 =
  9. 9.Diya has a ribbon 3/5 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  10. 10.2/3 − 2/5 =
  11. 11.9/10 − 1/5 =
  12. 12.5/6 − 4/5 =
  13. 13.7/8 − 2/3 =
  14. 14.Diya has a ribbon 1/2 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  15. 15.Aarav has a ribbon 1/4 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  16. 16.5/7 − 1/4 =
  17. 17.3/10 − 1/4 =
  18. 18.A tank is 5/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  19. 19.2/7 − 1/4 =
  20. 20.A bottle has 8/9 litre of juice. Aarav drinks 1/2 litre. How much juice is left (in litres)? =
  21. 21.A bottle has 5/7 litre of juice. Vihaan drinks 1/3 litre. How much juice is left (in litres)? =
  22. 22.5/9 − 1/2 =
  23. 23.4/5 − 1/3 =
  24. 24.2/3 − 4/7 =
  25. 25.Aarav has a ribbon 1/2 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  26. 26.A bottle has 7/8 litre of juice. Aarav drinks 1/3 litre. How much juice is left (in litres)? =
  27. 27.Diya has a ribbon 3/4 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  28. 28.Vihaan has a ribbon 4/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  29. 29.6/7 − 1/4 =
  30. 30.5/7 − 2/3 =
  31. 31.A bottle has 3/4 litre of juice. Ishaan drinks 1/7 litre. How much juice is left (in litres)? =
  32. 32.3/10 − 1/6 =
  33. 33.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? =
  34. 34.4/5 − 1/4 =
  35. 35.7/8 − 1/3 =
  36. 36.A tank is 1/2 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  37. 37.A bottle has 5/6 litre of juice. Diya drinks 5/8 litre. How much juice is left (in litres)? =
  38. 38.Kabir has a ribbon 1/2 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  39. 39.A tank is 8/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  40. 40.3/4 − 2/7 =

Answer key

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

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