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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 513 · 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. 1.1/2 − 1/7 =
  2. 2.A tank is 5/6 full of water. Then water filling 5/8 of the tank is used. What fraction of the tank is full now? =
  3. 3.1/2 − 3/8 =
  4. 4.Arjun has a ribbon 1/2 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  5. 5.7/9 − 1/6 =
  6. 6.A tank is 6/7 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  7. 7.Sara has a ribbon 4/5 m long and cuts off 3/4 m. How long is the ribbon now (in m)? =
  8. 8.1/3 − 2/9 =
  9. 9.Sara has a ribbon 1/2 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  10. 10.3/5 − 1/4 =
  11. 11.A bottle has 5/7 litre of juice. Vihaan drinks 1/2 litre. How much juice is left (in litres)? =
  12. 12.1/2 − 1/10 =
  13. 13.7/10 − 1/4 =
  14. 14.4/9 − 1/3 =
  15. 15.7/10 − 2/3 =
  16. 16.2/3 − 2/7 =
  17. 17.8/9 − 2/3 =
  18. 18.3/4 − 3/7 =
  19. 19.A tank is 9/10 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  20. 20.2/5 − 1/3 =
  21. 21.5/8 − 1/4 =
  22. 22.2/3 − 3/7 =
  23. 23.2/7 − 1/4 =
  24. 24.1/3 − 1/8 =
  25. 25.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? =
  26. 26.Sara has a ribbon 9/10 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  27. 27.A bottle has 7/8 litre of juice. Rohan drinks 2/3 litre. How much juice is left (in litres)? =
  28. 28.2/3 − 3/8 =
  29. 29.A tank is 5/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  30. 30.3/5 − 1/10 =
  31. 31.2/3 − 1/7 =
  32. 32.A tank is 5/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  33. 33.1/3 − 3/10 =
  34. 34.1/2 − 1/9 =
  35. 35.5/6 − 2/9 =
  36. 36.5/9 − 1/2 =
  37. 37.8/9 − 1/3 =
  38. 38.6/7 − 2/3 =
  39. 39.A bottle has 5/6 litre of juice. Arjun drinks 3/5 litre. How much juice is left (in litres)? =
  40. 40.4/5 − 1/4 =

Answer key

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

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