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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 420 · 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. 2.6/7 − 3/4 =
  3. 3.A tank is 3/4 full of water. Then water filling 2/5 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 5/7 of the tank is used. What fraction of the tank is full now? =
  5. 5.6/7 − 2/3 =
  6. 6.A bottle has 8/9 litre of juice. Arjun drinks 5/6 litre. How much juice is left (in litres)? =
  7. 7.3/4 − 3/10 =
  8. 8.A tank is 2/3 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  9. 9.5/7 − 2/3 =
  10. 10.5/6 − 1/4 =
  11. 11.2/3 − 3/5 =
  12. 12.Vihaan has a ribbon 3/4 m long and cuts off 5/7 m. How long is the ribbon now (in m)? =
  13. 13.2/3 − 3/10 =
  14. 14.3/4 − 7/10 =
  15. 15.4/5 − 3/4 =
  16. 16.Sara has a ribbon 8/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  17. 17.A bottle has 2/7 litre of juice. Anaya drinks 1/4 litre. How much juice is left (in litres)? =
  18. 18.5/8 − 1/3 =
  19. 19.2/3 − 2/9 =
  20. 20.5/6 − 3/5 =
  21. 21.A bottle has 5/6 litre of juice. Meera drinks 3/5 litre. How much juice is left (in litres)? =
  22. 22.2/3 − 1/9 =
  23. 23.2/3 − 2/5 =
  24. 24.A tank is 3/4 full of water. Then water filling 3/8 of the tank is used. What fraction of the tank is full now? =
  25. 25.Arjun has a ribbon 7/10 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  26. 26.A bottle has 1/2 litre of juice. Anaya drinks 1/10 litre. How much juice is left (in litres)? =
  27. 27.A tank is 5/6 full of water. Then water filling 5/9 of the tank is used. What fraction of the tank is full now? =
  28. 28.5/6 − 5/9 =
  29. 29.3/5 − 1/6 =
  30. 30.A bottle has 2/3 litre of juice. Vihaan drinks 1/7 litre. How much juice is left (in litres)? =
  31. 31.1/4 − 1/5 =
  32. 32.A bottle has 4/9 litre of juice. Anaya drinks 1/3 litre. How much juice is left (in litres)? =
  33. 33.7/8 − 1/3 =
  34. 34.3/4 − 1/2 =
  35. 35.4/7 − 1/3 =
  36. 36.Anaya has a ribbon 3/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  37. 37.A bottle has 3/4 litre of juice. Riya drinks 5/7 litre. How much juice is left (in litres)? =
  38. 38.A bottle has 5/7 litre of juice. Kabir drinks 1/4 litre. How much juice is left (in litres)? =
  39. 39.3/7 − 1/3 =
  40. 40.A bottle has 1/2 litre of juice. Anaya drinks 2/9 litre. How much juice is left (in litres)? =

Answer key

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

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