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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 665 · 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. 1.3/4 − 2/7 =
  2. 2.4/5 − 3/4 =
  3. 3.Vihaan has a ribbon 7/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  4. 4.4/5 − 7/10 =
  5. 5.6/7 − 3/4 =
  6. 6.1/2 − 1/7 =
  7. 7.A tank is 1/4 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  8. 8.7/8 − 1/4 =
  9. 9.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? =
  10. 10.A tank is 3/8 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  11. 11.7/9 − 1/6 =
  12. 12.Arjun has a ribbon 6/7 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  13. 13.Tara has a ribbon 3/4 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  14. 14.5/9 − 1/6 =
  15. 15.5/6 − 2/5 =
  16. 16.Kabir has a ribbon 1/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  17. 17.A bottle has 2/3 litre of juice. Meera drinks 5/8 litre. How much juice is left (in litres)? =
  18. 18.4/7 − 1/3 =
  19. 19.3/8 − 1/4 =
  20. 20.2/5 − 1/6 =
  21. 21.1/2 − 4/9 =
  22. 22.A tank is 2/3 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  23. 23.A bottle has 7/9 litre of juice. Meera drinks 1/6 litre. How much juice is left (in litres)? =
  24. 24.A tank is 4/5 full of water. Then water filling 7/10 of the tank is used. What fraction of the tank is full now? =
  25. 25.2/3 − 1/8 =
  26. 26.1/2 − 1/9 =
  27. 27.9/10 − 5/6 =
  28. 28.6/7 − 1/4 =
  29. 29.Ishaan has a ribbon 1/3 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  30. 30.5/6 − 5/9 =
  31. 31.9/10 − 1/3 =
  32. 32.A bottle has 1/2 litre of juice. Riya drinks 2/7 litre. How much juice is left (in litres)? =
  33. 33.A tank is 9/10 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  34. 34.A tank is 7/8 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  35. 35.A bottle has 6/7 litre of juice. Ishaan drinks 1/3 litre. How much juice is left (in litres)? =
  36. 36.A bottle has 5/6 litre of juice. Riya drinks 3/5 litre. How much juice is left (in litres)? =
  37. 37.A bottle has 1/6 litre of juice. Kabir drinks 1/9 litre. How much juice is left (in litres)? =
  38. 38.6/7 − 1/3 =
  39. 39.A tank is 7/10 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  40. 40.2/3 − 2/7 =

Answer key

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

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