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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 857 · 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.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? =
  2. 2.2/3 − 1/10 =
  3. 3.A tank is 1/2 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  4. 4.Arjun has a ribbon 5/6 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  5. 5.6/7 − 1/2 =
  6. 6.2/3 − 3/7 =
  7. 7.2/3 − 4/9 =
  8. 8.3/4 − 2/7 =
  9. 9.1/2 − 1/9 =
  10. 10.Arjun has a ribbon 5/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  11. 11.4/5 − 1/4 =
  12. 12.5/8 − 1/2 =
  13. 13.7/10 − 2/3 =
  14. 14.A bottle has 1/2 litre of juice. Ishaan drinks 1/9 litre. How much juice is left (in litres)? =
  15. 15.2/3 − 3/8 =
  16. 16.Sara has a ribbon 7/10 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  17. 17.2/5 − 1/10 =
  18. 18.1/2 − 3/7 =
  19. 19.4/5 − 2/3 =
  20. 20.A bottle has 3/5 litre of juice. Diya drinks 1/6 litre. How much juice is left (in litres)? =
  21. 21.7/9 − 1/6 =
  22. 22.2/3 − 1/8 =
  23. 23.A bottle has 2/3 litre of juice. Arjun drinks 5/9 litre. How much juice is left (in litres)? =
  24. 24.2/3 − 2/5 =
  25. 25.Rohan has a ribbon 6/7 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  26. 26.A tank is 2/3 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  27. 27.3/8 − 1/3 =
  28. 28.A tank is 2/3 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  29. 29.A bottle has 3/5 litre of juice. Meera drinks 1/10 litre. How much juice is left (in litres)? =
  30. 30.Tara has a ribbon 3/4 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  31. 31.5/9 − 1/3 =
  32. 32.4/7 − 1/2 =
  33. 33.1/4 − 1/8 =
  34. 34.4/9 − 1/3 =
  35. 35.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? =
  36. 36.A tank is 1/3 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  37. 37.5/7 − 1/2 =
  38. 38.A bottle has 7/8 litre of juice. Aarav drinks 5/6 litre. How much juice is left (in litres)? =
  39. 39.1/5 − 1/10 =
  40. 40.2/3 − 4/7 =

Answer key

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

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