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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 54 · 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. 1.7/9 − 2/3 =
  2. 2.1/3 − 2/9 =
  3. 3.A tank is 6/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  4. 4.A bottle has 4/5 litre of juice. Vihaan drinks 1/2 litre. How much juice is left (in litres)? =
  5. 5.7/9 − 1/3 =
  6. 6.5/7 − 1/3 =
  7. 7.Aarav has a ribbon 5/7 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  8. 8.8/9 − 1/2 =
  9. 9.Aarav has a ribbon 2/5 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  10. 10.A tank is 1/2 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  11. 11.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? =
  12. 12.9/10 − 1/6 =
  13. 13.1/3 − 2/7 =
  14. 14.5/6 − 1/4 =
  15. 15.A bottle has 5/6 litre of juice. Rohan drinks 2/5 litre. How much juice is left (in litres)? =
  16. 16.2/3 − 2/9 =
  17. 17.A tank is 7/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  18. 18.A tank is 9/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  19. 19.9/10 − 3/5 =
  20. 20.5/6 − 7/10 =
  21. 21.Meera has a ribbon 7/10 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  22. 22.A bottle has 1/2 litre of juice. Kabir drinks 3/8 litre. How much juice is left (in litres)? =
  23. 23.Riya has a ribbon 7/10 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  24. 24.Diya has a ribbon 1/2 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  25. 25.4/9 − 1/6 =
  26. 26.1/4 − 1/8 =
  27. 27.2/5 − 3/10 =
  28. 28.5/7 − 1/4 =
  29. 29.A tank is 2/3 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  30. 30.A tank is 3/4 full of water. Then water filling 4/7 of the tank is used. What fraction of the tank is full now? =
  31. 31.5/6 − 7/9 =
  32. 32.5/6 − 2/5 =
  33. 33.2/3 − 1/9 =
  34. 34.A bottle has 5/8 litre of juice. Kabir drinks 1/4 litre. How much juice is left (in litres)? =
  35. 35.1/2 − 2/7 =
  36. 36.Kabir has a ribbon 7/8 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  37. 37.1/2 − 1/6 =
  38. 38.Kabir has a ribbon 3/5 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  39. 39.3/4 − 5/7 =
  40. 40.1/3 − 1/8 =

Answer key

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

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