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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 903 · 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.A tank is 1/4 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  2. 2.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? =
  3. 3.4/5 − 1/10 =
  4. 4.1/3 − 1/10 =
  5. 5.A bottle has 3/4 litre of juice. Kabir drinks 7/10 litre. How much juice is left (in litres)? =
  6. 6.5/9 − 1/6 =
  7. 7.A bottle has 1/3 litre of juice. Kabir drinks 1/10 litre. How much juice is left (in litres)? =
  8. 8.Aarav has a ribbon 3/10 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  9. 9.3/4 − 1/8 =
  10. 10.A bottle has 3/4 litre of juice. Riya drinks 2/7 litre. How much juice is left (in litres)? =
  11. 11.3/5 − 1/2 =
  12. 12.A bottle has 3/8 litre of juice. Aarav drinks 1/3 litre. How much juice is left (in litres)? =
  13. 13.A tank is 3/4 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  14. 14.A bottle has 2/3 litre of juice. Vihaan drinks 3/7 litre. How much juice is left (in litres)? =
  15. 15.1/2 − 1/5 =
  16. 16.A bottle has 5/6 litre of juice. Arjun drinks 2/5 litre. How much juice is left (in litres)? =
  17. 17.3/4 − 3/10 =
  18. 18.4/5 − 3/10 =
  19. 19.A bottle has 4/7 litre of juice. Aarav drinks 1/3 litre. How much juice is left (in litres)? =
  20. 20.2/5 − 1/6 =
  21. 21.1/6 − 1/10 =
  22. 22.A tank is 1/3 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  23. 23.A bottle has 1/3 litre of juice. Vihaan drinks 1/5 litre. How much juice is left (in litres)? =
  24. 24.3/5 − 1/4 =
  25. 25.A bottle has 9/10 litre of juice. Diya drinks 1/4 litre. How much juice is left (in litres)? =
  26. 26.5/8 − 1/6 =
  27. 27.5/6 − 7/9 =
  28. 28.5/6 − 5/8 =
  29. 29.A bottle has 3/7 litre of juice. Anaya drinks 1/4 litre. How much juice is left (in litres)? =
  30. 30.1/3 − 3/10 =
  31. 31.1/2 − 1/3 =
  32. 32.A bottle has 6/7 litre of juice. Aarav drinks 1/3 litre. How much juice is left (in litres)? =
  33. 33.1/3 − 1/9 =
  34. 34.A tank is 7/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  35. 35.3/4 − 1/6 =
  36. 36.3/5 − 1/6 =
  37. 37.4/7 − 1/3 =
  38. 38.Anaya has a ribbon 5/6 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  39. 39.Sara has a ribbon 7/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  40. 40.3/8 − 1/6 =

Answer key

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

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