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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 932 · 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. 1.7/10 − 2/3 =
  2. 2.Sara has a ribbon 9/10 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  3. 3.Diya has a ribbon 3/8 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  4. 4.A bottle has 8/9 litre of juice. Riya drinks 1/2 litre. How much juice is left (in litres)? =
  5. 5.A tank is 1/3 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  6. 6.5/7 − 1/2 =
  7. 7.1/2 − 1/6 =
  8. 8.1/3 − 2/7 =
  9. 9.5/8 − 1/2 =
  10. 10.7/8 − 5/6 =
  11. 11.2/3 − 1/10 =
  12. 12.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? =
  13. 13.1/2 − 3/10 =
  14. 14.4/5 − 3/4 =
  15. 15.A tank is 1/3 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  16. 16.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? =
  17. 17.A bottle has 9/10 litre of juice. Ishaan drinks 4/5 litre. How much juice is left (in litres)? =
  18. 18.6/7 − 2/3 =
  19. 19.5/7 − 1/3 =
  20. 20.A bottle has 7/9 litre of juice. Aarav drinks 2/3 litre. How much juice is left (in litres)? =
  21. 21.4/7 − 1/3 =
  22. 22.2/3 − 5/9 =
  23. 23.A tank is 6/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  24. 24.A tank is 3/4 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  25. 25.Sara has a ribbon 5/6 m long and cuts off 1/10 m. How long is the ribbon now (in m)? =
  26. 26.A tank is 1/3 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  27. 27.A bottle has 1/2 litre of juice. Sara drinks 2/5 litre. How much juice is left (in litres)? =
  28. 28.3/4 − 2/7 =
  29. 29.Rohan has a ribbon 9/10 m long and cuts off 2/5 m. How long is the ribbon now (in m)? =
  30. 30.A bottle has 1/2 litre of juice. Riya drinks 3/8 litre. How much juice is left (in litres)? =
  31. 31.1/2 − 1/3 =
  32. 32.Arjun has a ribbon 4/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  33. 33.2/3 − 3/7 =
  34. 34.1/2 − 1/8 =
  35. 35.A bottle has 8/9 litre of juice. Arjun drinks 1/2 litre. How much juice is left (in litres)? =
  36. 36.1/6 − 1/10 =
  37. 37.1/3 − 1/10 =
  38. 38.A bottle has 7/9 litre of juice. Meera drinks 1/2 litre. How much juice is left (in litres)? =
  39. 39.2/9 − 1/6 =
  40. 40.Sara has a ribbon 7/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =

Answer key

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

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