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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 15 · 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 4/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  2. 2.5/7 − 2/3 =
  3. 3.A tank is 7/8 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  4. 4.6/7 − 2/3 =
  5. 5.1/2 − 1/7 =
  6. 6.A tank is 3/5 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  7. 7.A bottle has 5/6 litre of juice. Tara drinks 4/9 litre. How much juice is left (in litres)? =
  8. 8.A bottle has 5/6 litre of juice. Diya drinks 3/8 litre. How much juice is left (in litres)? =
  9. 9.A bottle has 3/4 litre of juice. Riya drinks 1/8 litre. How much juice is left (in litres)? =
  10. 10.A tank is 7/10 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  11. 11.3/5 − 1/3 =
  12. 12.6/7 − 1/2 =
  13. 13.A bottle has 3/4 litre of juice. Ishaan drinks 2/3 litre. How much juice is left (in litres)? =
  14. 14.Aarav has a ribbon 9/10 m long and cuts off 4/5 m. How long is the ribbon now (in m)? =
  15. 15.A tank is 3/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  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 4/7 litre of juice. Riya drinks 1/4 litre. How much juice is left (in litres)? =
  18. 18.A tank is 1/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  19. 19.3/4 − 1/8 =
  20. 20.Kabir has a ribbon 2/5 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  21. 21.6/7 − 1/3 =
  22. 22.Meera has a ribbon 7/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  23. 23.A tank is 5/6 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  24. 24.9/10 − 4/5 =
  25. 25.7/8 − 1/6 =
  26. 26.7/8 − 1/4 =
  27. 27.3/4 − 5/7 =
  28. 28.9/10 − 1/3 =
  29. 29.A bottle has 2/3 litre of juice. Ishaan drinks 1/8 litre. How much juice is left (in litres)? =
  30. 30.3/4 − 3/10 =
  31. 31.A tank is 5/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  32. 32.2/3 − 4/9 =
  33. 33.5/6 − 7/9 =
  34. 34.3/4 − 2/5 =
  35. 35.Rohan has a ribbon 3/4 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  36. 36.2/3 − 1/2 =
  37. 37.1/2 − 2/7 =
  38. 38.1/2 − 1/9 =
  39. 39.5/6 − 4/5 =
  40. 40.A bottle has 7/8 litre of juice. Kabir drinks 1/3 litre. How much juice is left (in litres)? =

Answer key

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

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