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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 404 · 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. 1.5/7 − 1/3 =
  2. 2.A bottle has 1/2 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =
  3. 3.2/3 − 4/7 =
  4. 4.Arjun has a ribbon 3/8 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  5. 5.5/7 − 1/4 =
  6. 6.A bottle has 1/5 litre of juice. Rohan drinks 1/10 litre. How much juice is left (in litres)? =
  7. 7.7/8 − 1/3 =
  8. 8.1/2 − 2/7 =
  9. 9.A bottle has 3/8 litre of juice. Rohan drinks 1/6 litre. How much juice is left (in litres)? =
  10. 10.4/9 − 1/6 =
  11. 11.1/3 − 3/10 =
  12. 12.3/7 − 1/3 =
  13. 13.7/9 − 2/3 =
  14. 14.A tank is 7/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  15. 15.Vihaan has a ribbon 3/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  16. 16.A tank is 7/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  17. 17.A tank is 3/5 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  18. 18.4/5 − 3/4 =
  19. 19.2/3 − 3/5 =
  20. 20.5/7 − 1/2 =
  21. 21.Arjun has a ribbon 3/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  22. 22.A tank is 7/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  23. 23.1/3 − 2/9 =
  24. 24.2/3 − 3/7 =
  25. 25.5/6 − 1/5 =
  26. 26.A tank is 9/10 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  27. 27.1/2 − 3/7 =
  28. 28.A bottle has 2/5 litre of juice. Vihaan drinks 1/3 litre. How much juice is left (in litres)? =
  29. 29.3/4 − 1/3 =
  30. 30.A bottle has 6/7 litre of juice. Anaya drinks 3/4 litre. How much juice is left (in litres)? =
  31. 31.5/6 − 1/9 =
  32. 32.6/7 − 3/4 =
  33. 33.A tank is 3/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  34. 34.5/6 − 1/10 =
  35. 35.1/3 − 1/7 =
  36. 36.1/2 − 1/6 =
  37. 37.4/5 − 2/3 =
  38. 38.A tank is 6/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  39. 39.A tank is 4/5 full of water. Then water filling 7/10 of the tank is used. What fraction of the tank is full now? =
  40. 40.A tank is 2/3 full of water. Then water filling 4/7 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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