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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 166 · 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 − 3/10 =
  2. 2.A tank is 5/6 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  3. 3.A tank is 3/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  4. 4.Riya has a ribbon 7/8 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  5. 5.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? =
  6. 6.4/5 − 1/6 =
  7. 7.Vihaan has a ribbon 3/4 m long and cuts off 3/7 m. How long is the ribbon now (in m)? =
  8. 8.A bottle has 5/9 litre of juice. Meera drinks 1/2 litre. How much juice is left (in litres)? =
  9. 9.3/10 − 1/4 =
  10. 10.2/3 − 5/9 =
  11. 11.A tank is 7/10 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  12. 12.A bottle has 2/3 litre of juice. Arjun drinks 4/9 litre. How much juice is left (in litres)? =
  13. 13.A bottle has 6/7 litre of juice. Tara drinks 2/3 litre. How much juice is left (in litres)? =
  14. 14.1/3 − 1/4 =
  15. 15.A bottle has 5/9 litre of juice. Diya drinks 1/6 litre. How much juice is left (in litres)? =
  16. 16.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? =
  17. 17.4/7 − 1/2 =
  18. 18.2/3 − 1/8 =
  19. 19.7/10 − 1/2 =
  20. 20.7/8 − 5/6 =
  21. 21.7/10 − 3/5 =
  22. 22.A tank is 9/10 full of water. Then water filling 5/6 of the tank is used. What fraction of the tank is full now? =
  23. 23.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? =
  24. 24.A tank is 5/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  25. 25.5/7 − 1/4 =
  26. 26.5/9 − 1/3 =
  27. 27.1/3 − 1/7 =
  28. 28.A bottle has 1/2 litre of juice. Vihaan drinks 2/5 litre. How much juice is left (in litres)? =
  29. 29.2/5 − 1/10 =
  30. 30.A tank is 5/6 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  31. 31.4/5 − 3/4 =
  32. 32.A bottle has 3/4 litre of juice. Riya drinks 3/7 litre. How much juice is left (in litres)? =
  33. 33.A bottle has 4/5 litre of juice. Rohan drinks 1/10 litre. How much juice is left (in litres)? =
  34. 34.Aarav has a ribbon 8/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  35. 35.1/2 − 1/10 =
  36. 36.1/3 − 3/10 =
  37. 37.5/6 − 1/8 =
  38. 38.A bottle has 7/9 litre of juice. Arjun drinks 1/6 litre. How much juice is left (in litres)? =
  39. 39.A tank is 2/3 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  40. 40.1/2 − 3/7 =

Answer key

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

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