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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 199 · 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. 1.2/3 − 1/7 =
  2. 2.5/6 − 4/5 =
  3. 3.A tank is 7/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  4. 4.Meera has a ribbon 7/8 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  5. 5.1/6 − 1/9 =
  6. 6.1/2 − 2/9 =
  7. 7.3/5 − 1/2 =
  8. 8.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? =
  9. 9.5/8 − 1/3 =
  10. 10.Sara has a ribbon 5/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  11. 11.4/5 − 3/4 =
  12. 12.Meera has a ribbon 4/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  13. 13.5/6 − 3/8 =
  14. 14.9/10 − 1/4 =
  15. 15.A bottle has 5/6 litre of juice. Kabir drinks 1/8 litre. How much juice is left (in litres)? =
  16. 16.A bottle has 4/5 litre of juice. Ishaan drinks 1/10 litre. How much juice is left (in litres)? =
  17. 17.A bottle has 9/10 litre of juice. Riya drinks 4/5 litre. How much juice is left (in litres)? =
  18. 18.A bottle has 1/3 litre of juice. Meera drinks 1/8 litre. How much juice is left (in litres)? =
  19. 19.1/5 − 1/6 =
  20. 20.5/6 − 5/8 =
  21. 21.A tank is 5/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  22. 22.A tank is 1/2 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  23. 23.A tank is 3/10 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  24. 24.A bottle has 7/8 litre of juice. Vihaan drinks 3/4 litre. How much juice is left (in litres)? =
  25. 25.5/6 − 2/9 =
  26. 26.1/3 − 1/7 =
  27. 27.1/3 − 3/10 =
  28. 28.3/4 − 3/5 =
  29. 29.2/3 − 1/9 =
  30. 30.Meera has a ribbon 3/10 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  31. 31.A tank is 4/5 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  32. 32.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? =
  33. 33.Arjun has a ribbon 5/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  34. 34.4/9 − 1/3 =
  35. 35.1/2 − 3/10 =
  36. 36.A bottle has 9/10 litre of juice. Arjun drinks 3/5 litre. How much juice is left (in litres)? =
  37. 37.3/5 − 1/10 =
  38. 38.A tank is 7/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  39. 39.7/9 − 1/6 =
  40. 40.3/5 − 1/3 =

Answer key

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

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