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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 8 · 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. 2.5/6 − 3/5 =
  3. 3.1/2 − 4/9 =
  4. 4.A tank is 2/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  5. 5.Kabir has a ribbon 3/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  6. 6.A bottle has 4/5 litre of juice. Riya drinks 3/10 litre. How much juice is left (in litres)? =
  7. 7.3/5 − 1/4 =
  8. 8.5/6 − 1/8 =
  9. 9.A bottle has 9/10 litre of juice. Meera drinks 3/4 litre. How much juice is left (in litres)? =
  10. 10.Kabir has a ribbon 9/10 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  11. 11.A tank is 3/4 full of water. Then water filling 5/8 of the tank is used. What fraction of the tank is full now? =
  12. 12.A tank is 1/2 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  13. 13.1/3 − 1/5 =
  14. 14.3/4 − 1/10 =
  15. 15.9/10 − 3/5 =
  16. 16.2/3 − 5/9 =
  17. 17.2/3 − 1/8 =
  18. 18.2/3 − 3/8 =
  19. 19.6/7 − 1/2 =
  20. 20.4/5 − 3/4 =
  21. 21.Meera has a ribbon 2/3 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  22. 22.A tank is 5/6 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  23. 23.2/3 − 4/7 =
  24. 24.5/6 − 4/9 =
  25. 25.1/2 − 1/6 =
  26. 26.Ishaan has a ribbon 1/3 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  27. 27.Arjun has a ribbon 2/3 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  28. 28.A tank is 1/2 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  29. 29.Aarav has a ribbon 8/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  30. 30.2/3 − 2/5 =
  31. 31.A tank is 6/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  32. 32.4/7 − 1/3 =
  33. 33.3/4 − 3/10 =
  34. 34.8/9 − 1/6 =
  35. 35.5/6 − 3/8 =
  36. 36.Aarav has a ribbon 3/4 m long and cuts off 4/7 m. How long is the ribbon now (in m)? =
  37. 37.1/2 − 1/9 =
  38. 38.2/3 − 1/6 =
  39. 39.1/4 − 1/7 =
  40. 40.3/5 − 1/10 =

Answer key

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

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