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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 135 · 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. 1.2/3 − 1/7 =
  2. 2.4/5 − 3/4 =
  3. 3.5/6 − 3/5 =
  4. 4.Riya has a ribbon 3/4 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  5. 5.Ishaan has a ribbon 4/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  6. 6.7/9 − 1/3 =
  7. 7.9/10 − 4/5 =
  8. 8.6/7 − 2/3 =
  9. 9.Arjun has a ribbon 3/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  10. 10.1/2 − 1/3 =
  11. 11.1/2 − 1/10 =
  12. 12.Arjun has a ribbon 3/4 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  13. 13.A tank is 5/6 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  14. 14.2/3 − 3/10 =
  15. 15.1/2 − 1/9 =
  16. 16.1/6 − 1/10 =
  17. 17.Aarav has a ribbon 2/3 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  18. 18.3/4 − 1/5 =
  19. 19.4/5 − 1/3 =
  20. 20.Kabir has a ribbon 7/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  21. 21.4/9 − 1/6 =
  22. 22.5/6 − 1/9 =
  23. 23.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? =
  24. 24.A bottle has 4/5 litre of juice. Aarav drinks 7/10 litre. How much juice is left (in litres)? =
  25. 25.5/8 − 1/4 =
  26. 26.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? =
  27. 27.3/4 − 2/3 =
  28. 28.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? =
  29. 29.2/3 − 4/9 =
  30. 30.5/9 − 1/2 =
  31. 31.7/8 − 3/4 =
  32. 32.A tank is 4/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  33. 33.A tank is 3/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  34. 34.A bottle has 1/2 litre of juice. Riya drinks 2/9 litre. How much juice is left (in litres)? =
  35. 35.A tank is 5/6 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  36. 36.6/7 − 1/2 =
  37. 37.2/3 − 2/9 =
  38. 38.5/6 − 7/9 =
  39. 39.A bottle has 5/6 litre of juice. Ishaan drinks 3/8 litre. How much juice is left (in litres)? =
  40. 40.7/9 − 1/6 =

Answer key

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

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