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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 297 · 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 2/3 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  2. 2.7/9 − 2/3 =
  3. 3.3/4 − 5/7 =
  4. 4.5/6 − 2/9 =
  5. 5.Aarav has a ribbon 2/3 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  6. 6.1/2 − 2/9 =
  7. 7.4/5 − 1/10 =
  8. 8.3/4 − 3/10 =
  9. 9.7/8 − 3/4 =
  10. 10.2/3 − 1/5 =
  11. 11.5/6 − 1/9 =
  12. 12.Aarav has a ribbon 2/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  13. 13.3/4 − 1/10 =
  14. 14.A tank is 8/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  15. 15.2/3 − 5/9 =
  16. 16.5/6 − 3/10 =
  17. 17.1/3 − 1/8 =
  18. 18.5/7 − 1/2 =
  19. 19.1/2 − 3/10 =
  20. 20.A tank is 3/7 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  21. 21.1/3 − 3/10 =
  22. 22.1/3 − 1/6 =
  23. 23.2/9 − 1/6 =
  24. 24.Anaya has a ribbon 3/5 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  25. 25.8/9 − 1/3 =
  26. 26.A bottle has 2/3 litre of juice. Diya drinks 1/10 litre. How much juice is left (in litres)? =
  27. 27.6/7 − 2/3 =
  28. 28.Sara has a ribbon 2/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  29. 29.A tank is 3/8 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  30. 30.2/3 − 1/8 =
  31. 31.2/5 − 3/10 =
  32. 32.3/4 − 3/5 =
  33. 33.A bottle has 4/7 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =
  34. 34.A tank is 1/5 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  35. 35.4/5 − 1/4 =
  36. 36.7/10 − 1/4 =
  37. 37.9/10 − 1/2 =
  38. 38.A tank is 1/3 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  39. 39.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? =
  40. 40.A tank is 3/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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