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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 4 · 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. 1.1/2 − 3/10 =
  2. 2.3/4 − 1/10 =
  3. 3.5/6 − 2/5 =
  4. 4.3/4 − 5/8 =
  5. 5.2/3 − 5/9 =
  6. 6.7/8 − 1/3 =
  7. 7.3/4 − 1/5 =
  8. 8.6/7 − 1/3 =
  9. 9.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? =
  10. 10.4/9 − 1/3 =
  11. 11.5/6 − 1/5 =
  12. 12.A tank is 4/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  13. 13.7/9 − 1/3 =
  14. 14.1/3 − 1/6 =
  15. 15.5/7 − 1/4 =
  16. 16.9/10 − 5/6 =
  17. 17.8/9 − 1/2 =
  18. 18.Kabir has a ribbon 1/2 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  19. 19.1/3 − 1/8 =
  20. 20.Meera has a ribbon 4/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  21. 21.5/6 − 1/8 =
  22. 22.A tank is 7/8 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  23. 23.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? =
  24. 24.Tara has a ribbon 5/6 m long and cuts off 7/9 m. How long is the ribbon now (in m)? =
  25. 25.2/3 − 1/4 =
  26. 26.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? =
  27. 27.A bottle has 5/6 litre of juice. Vihaan drinks 2/5 litre. How much juice is left (in litres)? =
  28. 28.3/4 − 3/10 =
  29. 29.5/6 − 3/10 =
  30. 30.4/5 − 1/3 =
  31. 31.3/5 − 1/3 =
  32. 32.4/5 − 1/6 =
  33. 33.A tank is 4/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  34. 34.1/5 − 1/6 =
  35. 35.4/7 − 1/2 =
  36. 36.A bottle has 5/9 litre of juice. Diya drinks 1/2 litre. How much juice is left (in litres)? =
  37. 37.A tank is 2/3 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  38. 38.A bottle has 3/4 litre of juice. Ishaan drinks 3/10 litre. How much juice is left (in litres)? =
  39. 39.Kabir has a ribbon 2/3 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  40. 40.A bottle has 1/3 litre of juice. Diya drinks 1/7 litre. How much juice is left (in litres)? =

Answer key

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

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