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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 427 · 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. 1.7/8 − 1/4 =
  2. 2.7/9 − 1/3 =
  3. 3.A bottle has 9/10 litre of juice. Ishaan drinks 1/4 litre. How much juice is left (in litres)? =
  4. 4.A tank is 9/10 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  5. 5.4/5 − 2/3 =
  6. 6.A tank is 1/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  7. 7.Ishaan has a ribbon 1/3 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  8. 8.1/3 − 2/9 =
  9. 9.3/4 − 1/5 =
  10. 10.3/4 − 7/10 =
  11. 11.3/10 − 1/6 =
  12. 12.3/8 − 1/6 =
  13. 13.8/9 − 1/2 =
  14. 14.Ishaan has a ribbon 7/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  15. 15.1/2 − 2/5 =
  16. 16.A tank is 4/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  17. 17.5/6 − 1/8 =
  18. 18.A bottle has 3/4 litre of juice. Sara drinks 4/7 litre. How much juice is left (in litres)? =
  19. 19.9/10 − 2/3 =
  20. 20.3/5 − 3/10 =
  21. 21.7/10 − 2/3 =
  22. 22.Vihaan has a ribbon 1/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  23. 23.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? =
  24. 24.3/5 − 1/3 =
  25. 25.Vihaan has a ribbon 5/7 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  26. 26.1/4 − 1/8 =
  27. 27.A tank is 1/3 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  28. 28.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? =
  29. 29.A bottle has 1/4 litre of juice. Sara drinks 1/10 litre. How much juice is left (in litres)? =
  30. 30.A tank is 3/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  31. 31.A tank is 2/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  32. 32.5/6 − 1/4 =
  33. 33.A bottle has 3/4 litre of juice. Anaya drinks 3/7 litre. How much juice is left (in litres)? =
  34. 34.2/3 − 2/7 =
  35. 35.A tank is 7/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  36. 36.5/6 − 7/10 =
  37. 37.7/10 − 2/5 =
  38. 38.2/3 − 1/9 =
  39. 39.A tank is 4/5 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  40. 40.3/4 − 5/8 =

Answer key

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

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