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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 747 · 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. 1.7/8 − 3/4 =
  2. 2.A tank is 3/8 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  3. 3.A tank is 1/4 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  4. 4.2/5 − 1/3 =
  5. 5.1/6 − 1/10 =
  6. 6.1/4 − 1/7 =
  7. 7.A tank is 3/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  8. 8.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? =
  9. 9.Kabir has a ribbon 5/6 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  10. 10.A bottle has 9/10 litre of juice. Ishaan drinks 1/4 litre. How much juice is left (in litres)? =
  11. 11.1/5 − 1/10 =
  12. 12.2/3 − 3/7 =
  13. 13.Aarav has a ribbon 3/4 m long and cuts off 4/7 m. How long is the ribbon now (in m)? =
  14. 14.Ishaan has a ribbon 1/5 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  15. 15.A tank is 3/4 full of water. Then water filling 5/7 of the tank is used. What fraction of the tank is full now? =
  16. 16.A bottle has 1/6 litre of juice. Aarav drinks 1/9 litre. How much juice is left (in litres)? =
  17. 17.5/7 − 2/3 =
  18. 18.1/2 − 1/7 =
  19. 19.A tank is 1/2 full of water. Then water filling 4/9 of the tank is used. What fraction of the tank is full now? =
  20. 20.2/3 − 1/4 =
  21. 21.5/8 − 1/2 =
  22. 22.7/10 − 1/2 =
  23. 23.8/9 − 1/3 =
  24. 24.A bottle has 5/6 litre of juice. Riya drinks 1/10 litre. How much juice is left (in litres)? =
  25. 25.2/5 − 1/4 =
  26. 26.5/9 − 1/6 =
  27. 27.9/10 − 1/6 =
  28. 28.4/5 − 1/2 =
  29. 29.1/2 − 3/7 =
  30. 30.1/3 − 1/10 =
  31. 31.A bottle has 1/2 litre of juice. Anaya drinks 1/7 litre. How much juice is left (in litres)? =
  32. 32.A tank is 5/6 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  33. 33.7/9 − 1/2 =
  34. 34.A tank is 5/6 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  35. 35.A bottle has 7/9 litre of juice. Ishaan drinks 1/6 litre. How much juice is left (in litres)? =
  36. 36.Anaya has a ribbon 5/6 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  37. 37.7/10 − 1/6 =
  38. 38.1/3 − 3/10 =
  39. 39.Vihaan has a ribbon 5/6 m long and cuts off 7/10 m. How long is the ribbon now (in m)? =
  40. 40.1/3 − 1/9 =

Answer key

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

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