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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 732 · 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.Kabir has a ribbon 6/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  2. 2.1/4 − 1/7 =
  3. 3.A bottle has 7/8 litre of juice. Diya drinks 5/6 litre. How much juice is left (in litres)? =
  4. 4.A tank is 4/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  5. 5.7/8 − 1/6 =
  6. 6.5/7 − 1/3 =
  7. 7.A bottle has 1/4 litre of juice. Rohan drinks 1/5 litre. How much juice is left (in litres)? =
  8. 8.3/8 − 1/6 =
  9. 9.A bottle has 3/4 litre of juice. Sara drinks 3/5 litre. How much juice is left (in litres)? =
  10. 10.A bottle has 9/10 litre of juice. Sara drinks 1/2 litre. How much juice is left (in litres)? =
  11. 11.3/5 − 1/10 =
  12. 12.1/2 − 1/5 =
  13. 13.6/7 − 3/4 =
  14. 14.A bottle has 1/4 litre of juice. Rohan drinks 1/6 litre. How much juice is left (in litres)? =
  15. 15.Meera has a ribbon 4/5 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  16. 16.2/3 − 1/7 =
  17. 17.2/3 − 1/6 =
  18. 18.A bottle has 1/3 litre of juice. Riya drinks 1/7 litre. How much juice is left (in litres)? =
  19. 19.A tank is 7/10 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  20. 20.3/4 − 2/3 =
  21. 21.4/5 − 1/4 =
  22. 22.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? =
  23. 23.3/4 − 4/7 =
  24. 24.4/9 − 1/3 =
  25. 25.A bottle has 5/6 litre of juice. Tara drinks 1/9 litre. How much juice is left (in litres)? =
  26. 26.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? =
  27. 27.1/2 − 4/9 =
  28. 28.1/3 − 1/7 =
  29. 29.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? =
  30. 30.1/4 − 1/6 =
  31. 31.7/10 − 3/5 =
  32. 32.Sara has a ribbon 1/6 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  33. 33.Sara has a ribbon 5/6 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  34. 34.3/4 − 1/5 =
  35. 35.2/3 − 3/7 =
  36. 36.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? =
  37. 37.1/2 − 1/9 =
  38. 38.5/6 − 7/9 =
  39. 39.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? =
  40. 40.3/4 − 3/5 =

Answer key

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

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