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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 514 · 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. 1.7/10 − 1/3 =
  2. 2.8/9 − 1/2 =
  3. 3.5/7 − 2/3 =
  4. 4.1/3 − 1/10 =
  5. 5.3/4 − 2/7 =
  6. 6.5/6 − 1/2 =
  7. 7.3/4 − 1/7 =
  8. 8.Diya has a ribbon 1/2 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  9. 9.1/5 − 1/10 =
  10. 10.3/10 − 1/5 =
  11. 11.1/2 − 3/7 =
  12. 12.A bottle has 1/3 litre of juice. Riya drinks 1/10 litre. How much juice is left (in litres)? =
  13. 13.1/2 − 1/9 =
  14. 14.3/7 − 1/3 =
  15. 15.5/6 − 2/9 =
  16. 16.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? =
  17. 17.Tara has a ribbon 5/6 m long and cuts off 7/10 m. How long is the ribbon now (in m)? =
  18. 18.A bottle has 5/7 litre of juice. Arjun drinks 1/3 litre. How much juice is left (in litres)? =
  19. 19.4/5 − 7/10 =
  20. 20.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? =
  21. 21.7/10 − 1/6 =
  22. 22.4/7 − 1/2 =
  23. 23.4/5 − 1/10 =
  24. 24.A tank is 4/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  25. 25.7/8 − 1/4 =
  26. 26.Meera has a ribbon 1/2 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  27. 27.1/3 − 2/9 =
  28. 28.4/5 − 1/3 =
  29. 29.A tank is 2/3 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  30. 30.2/5 − 1/4 =
  31. 31.3/5 − 1/10 =
  32. 32.1/3 − 1/8 =
  33. 33.6/7 − 2/3 =
  34. 34.A tank is 9/10 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  35. 35.1/3 − 1/9 =
  36. 36.A tank is 3/4 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  37. 37.3/5 − 1/6 =
  38. 38.Rohan has a ribbon 5/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  39. 39.5/9 − 1/2 =
  40. 40.A tank is 5/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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