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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 816 · 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 7/8 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  2. 2.A bottle has 1/3 litre of juice. Tara drinks 1/9 litre. How much juice is left (in litres)? =
  3. 3.1/2 − 1/4 =
  4. 4.5/8 − 1/4 =
  5. 5.Diya has a ribbon 3/4 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  6. 6.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? =
  7. 7.Diya has a ribbon 3/5 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  8. 8.2/3 − 5/8 =
  9. 9.1/4 − 1/5 =
  10. 10.1/5 − 1/6 =
  11. 11.1/2 − 1/9 =
  12. 12.3/8 − 1/3 =
  13. 13.A tank is 7/8 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  14. 14.4/5 − 3/10 =
  15. 15.A tank is 5/6 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  16. 16.4/5 − 7/10 =
  17. 17.9/10 − 1/4 =
  18. 18.9/10 − 5/6 =
  19. 19.3/4 − 7/10 =
  20. 20.9/10 − 4/5 =
  21. 21.Diya has a ribbon 5/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  22. 22.Vihaan has a ribbon 4/5 m long and cuts off 7/10 m. How long is the ribbon now (in m)? =
  23. 23.9/10 − 1/5 =
  24. 24.1/3 − 1/9 =
  25. 25.6/7 − 1/2 =
  26. 26.9/10 − 2/3 =
  27. 27.A bottle has 5/6 litre of juice. Tara drinks 3/4 litre. How much juice is left (in litres)? =
  28. 28.Sara has a ribbon 2/3 m long and cuts off 1/5 m. How long is the ribbon now (in m)? =
  29. 29.4/5 − 1/3 =
  30. 30.5/6 − 2/9 =
  31. 31.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? =
  32. 32.5/7 − 1/4 =
  33. 33.A tank is 3/4 full of water. Then water filling 3/7 of the tank is used. What fraction of the tank is full now? =
  34. 34.A bottle has 9/10 litre of juice. Diya drinks 2/5 litre. How much juice is left (in litres)? =
  35. 35.A bottle has 2/3 litre of juice. Riya drinks 2/9 litre. How much juice is left (in litres)? =
  36. 36.A bottle has 1/5 litre of juice. Ishaan drinks 1/6 litre. How much juice is left (in litres)? =
  37. 37.7/9 − 1/3 =
  38. 38.7/10 − 1/6 =
  39. 39.7/10 − 1/5 =
  40. 40.9/10 − 2/5 =

Answer key

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

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