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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 707 · 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 7/10 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  2. 2.4/5 − 2/3 =
  3. 3.A tank is 7/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  4. 4.A tank is 2/3 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  5. 5.Ishaan has a ribbon 1/3 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  6. 6.1/3 − 2/9 =
  7. 7.2/3 − 5/9 =
  8. 8.7/8 − 3/4 =
  9. 9.A bottle has 5/6 litre of juice. Rohan drinks 5/8 litre. How much juice is left (in litres)? =
  10. 10.5/8 − 1/3 =
  11. 11.4/5 − 1/10 =
  12. 12.A bottle has 5/7 litre of juice. Rohan drinks 1/4 litre. How much juice is left (in litres)? =
  13. 13.2/3 − 3/8 =
  14. 14.5/7 − 1/3 =
  15. 15.A bottle has 3/4 litre of juice. Ishaan drinks 3/10 litre. How much juice is left (in litres)? =
  16. 16.4/5 − 1/6 =
  17. 17.A bottle has 5/6 litre of juice. Diya drinks 1/9 litre. How much juice is left (in litres)? =
  18. 18.A tank is 3/4 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  19. 19.A bottle has 5/7 litre of juice. Riya drinks 1/2 litre. How much juice is left (in litres)? =
  20. 20.A bottle has 2/7 litre of juice. Vihaan drinks 1/4 litre. How much juice is left (in litres)? =
  21. 21.1/4 − 1/5 =
  22. 22.3/4 − 2/7 =
  23. 23.7/10 − 1/3 =
  24. 24.3/5 − 1/4 =
  25. 25.4/7 − 1/3 =
  26. 26.2/3 − 4/9 =
  27. 27.A tank is 3/4 full of water. Then water filling 7/10 of the tank is used. What fraction of the tank is full now? =
  28. 28.A tank is 1/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  29. 29.3/4 − 1/7 =
  30. 30.3/4 − 3/5 =
  31. 31.A tank is 5/6 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  32. 32.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? =
  33. 33.A bottle has 2/3 litre of juice. Diya drinks 2/5 litre. How much juice is left (in litres)? =
  34. 34.2/9 − 1/6 =
  35. 35.A tank is 3/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  36. 36.Kabir has a ribbon 4/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  37. 37.A bottle has 3/4 litre of juice. Sara drinks 2/5 litre. How much juice is left (in litres)? =
  38. 38.3/7 − 1/3 =
  39. 39.A tank is 7/10 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  40. 40.A tank is 4/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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