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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 799 · 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 − 3/7 =
  2. 2.1/3 − 1/8 =
  3. 3.4/5 − 1/2 =
  4. 4.7/8 − 1/3 =
  5. 5.3/4 − 2/3 =
  6. 6.Tara has a ribbon 2/3 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  7. 7.4/9 − 1/3 =
  8. 8.5/6 − 1/8 =
  9. 9.Rohan has a ribbon 2/3 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  10. 10.3/4 − 1/6 =
  11. 11.2/3 − 1/7 =
  12. 12.7/10 − 1/5 =
  13. 13.1/3 − 2/9 =
  14. 14.Diya has a ribbon 1/3 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  15. 15.3/4 − 2/5 =
  16. 16.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? =
  17. 17.A bottle has 4/9 litre of juice. Sara drinks 1/6 litre. How much juice is left (in litres)? =
  18. 18.1/2 − 1/7 =
  19. 19.2/5 − 3/10 =
  20. 20.A tank is 1/2 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  21. 21.Arjun has a ribbon 3/10 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  22. 22.1/2 − 3/7 =
  23. 23.A tank is 5/6 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  24. 24.2/3 − 4/7 =
  25. 25.4/5 − 7/10 =
  26. 26.9/10 − 1/3 =
  27. 27.A bottle has 4/9 litre of juice. Rohan drinks 1/6 litre. How much juice is left (in litres)? =
  28. 28.Rohan has a ribbon 1/2 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  29. 29.A bottle has 9/10 litre of juice. Rohan drinks 2/3 litre. How much juice is left (in litres)? =
  30. 30.A tank is 5/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  31. 31.Riya has a ribbon 6/7 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  32. 32.Aarav has a ribbon 1/3 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  33. 33.6/7 − 1/3 =
  34. 34.A bottle has 5/6 litre of juice. Arjun drinks 4/9 litre. How much juice is left (in litres)? =
  35. 35.4/5 − 1/3 =
  36. 36.Kabir has a ribbon 4/5 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  37. 37.A bottle has 5/7 litre of juice. Rohan drinks 1/4 litre. How much juice is left (in litres)? =
  38. 38.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? =
  39. 39.2/3 − 1/9 =
  40. 40.A tank is 3/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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