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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 100 · 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.Ishaan has a ribbon 9/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  2. 2.5/8 − 1/2 =
  3. 3.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? =
  4. 4.A tank is 3/4 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  5. 5.3/4 − 1/7 =
  6. 6.4/5 − 3/10 =
  7. 7.Ishaan has a ribbon 1/3 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  8. 8.1/3 − 1/10 =
  9. 9.3/7 − 1/3 =
  10. 10.A tank is 1/2 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  11. 11.3/5 − 1/6 =
  12. 12.2/3 − 5/8 =
  13. 13.5/7 − 1/3 =
  14. 14.8/9 − 1/3 =
  15. 15.3/4 − 5/8 =
  16. 16.1/3 − 3/10 =
  17. 17.5/6 − 4/9 =
  18. 18.3/4 − 2/7 =
  19. 19.Aarav has a ribbon 3/8 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  20. 20.A tank is 1/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  21. 21.Tara has a ribbon 9/10 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  22. 22.3/4 − 1/8 =
  23. 23.A bottle has 4/5 litre of juice. Anaya drinks 1/6 litre. How much juice is left (in litres)? =
  24. 24.A tank is 5/6 full of water. Then water filling 7/9 of the tank is used. What fraction of the tank is full now? =
  25. 25.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? =
  26. 26.A bottle has 3/4 litre of juice. Rohan drinks 3/8 litre. How much juice is left (in litres)? =
  27. 27.A tank is 1/5 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  28. 28.A bottle has 2/3 litre of juice. Vihaan drinks 3/8 litre. How much juice is left (in litres)? =
  29. 29.2/3 − 3/8 =
  30. 30.Aarav has a ribbon 4/5 m long and cuts off 3/4 m. How long is the ribbon now (in m)? =
  31. 31.Ishaan has a ribbon 5/6 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  32. 32.A tank is 7/10 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  33. 33.7/8 − 2/3 =
  34. 34.3/4 − 3/10 =
  35. 35.3/5 − 3/10 =
  36. 36.5/7 − 2/3 =
  37. 37.2/5 − 3/10 =
  38. 38.5/9 − 1/3 =
  39. 39.Kabir has a ribbon 4/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  40. 40.3/5 − 1/2 =

Answer key

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

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