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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 281 · 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 6/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  2. 2.9/10 − 2/3 =
  3. 3.A tank is 4/5 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  4. 4.3/4 − 3/7 =
  5. 5.3/4 − 5/7 =
  6. 6.Sara has a ribbon 5/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  7. 7.2/3 − 2/7 =
  8. 8.7/9 − 1/2 =
  9. 9.A tank is 1/2 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  10. 10.Meera has a ribbon 2/3 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  11. 11.A tank is 9/10 full of water. Then water filling 4/5 of the tank is used. What fraction of the tank is full now? =
  12. 12.3/4 − 1/5 =
  13. 13.A tank is 5/7 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  14. 14.1/3 − 1/4 =
  15. 15.8/9 − 1/3 =
  16. 16.7/10 − 1/5 =
  17. 17.A bottle has 9/10 litre of juice. Sara drinks 1/5 litre. How much juice is left (in litres)? =
  18. 18.2/3 − 3/7 =
  19. 19.2/3 − 2/9 =
  20. 20.1/3 − 1/7 =
  21. 21.3/8 − 1/3 =
  22. 22.2/5 − 1/6 =
  23. 23.A bottle has 2/3 litre of juice. Anaya drinks 2/7 litre. How much juice is left (in litres)? =
  24. 24.6/7 − 3/4 =
  25. 25.A tank is 5/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  26. 26.5/8 − 1/4 =
  27. 27.8/9 − 1/6 =
  28. 28.1/2 − 2/5 =
  29. 29.A bottle has 1/2 litre of juice. Tara drinks 1/7 litre. How much juice is left (in litres)? =
  30. 30.Rohan has a ribbon 5/6 m long and cuts off 4/5 m. How long is the ribbon now (in m)? =
  31. 31.A tank is 2/3 full of water. Then water filling 5/8 of the tank is used. What fraction of the tank is full now? =
  32. 32.2/7 − 1/4 =
  33. 33.1/5 − 1/6 =
  34. 34.A bottle has 3/7 litre of juice. Vihaan drinks 1/3 litre. How much juice is left (in litres)? =
  35. 35.1/2 − 1/6 =
  36. 36.5/7 − 1/3 =
  37. 37.4/9 − 1/3 =
  38. 38.1/4 − 1/7 =
  39. 39.A bottle has 1/2 litre of juice. Sara drinks 3/8 litre. How much juice is left (in litres)? =
  40. 40.1/2 − 1/3 =

Answer key

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

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