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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 651 · 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 1/3 full of water. Then water filling 2/7 of the tank is used. What fraction of the tank is full now? =
  2. 2.Kabir has a ribbon 1/4 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  3. 3.5/7 − 2/3 =
  4. 4.2/3 − 4/9 =
  5. 5.7/10 − 1/6 =
  6. 6.9/10 − 4/5 =
  7. 7.5/6 − 4/5 =
  8. 8.A bottle has 2/7 litre of juice. Kabir drinks 1/4 litre. How much juice is left (in litres)? =
  9. 9.6/7 − 2/3 =
  10. 10.7/9 − 2/3 =
  11. 11.A bottle has 3/4 litre of juice. Rohan drinks 3/8 litre. How much juice is left (in litres)? =
  12. 12.A tank is 5/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  13. 13.Vihaan has a ribbon 5/9 m long and cuts off 1/2 m. How long is the ribbon now (in m)? =
  14. 14.A tank is 3/4 full of water. Then water filling 5/8 of the tank is used. What fraction of the tank is full now? =
  15. 15.3/4 − 2/5 =
  16. 16.5/6 − 2/3 =
  17. 17.Sara has a ribbon 2/3 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  18. 18.A bottle has 2/3 litre of juice. Meera drinks 1/4 litre. How much juice is left (in litres)? =
  19. 19.A tank is 2/5 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  20. 20.7/10 − 1/4 =
  21. 21.Aarav has a ribbon 4/9 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  22. 22.5/9 − 1/3 =
  23. 23.4/9 − 1/3 =
  24. 24.A bottle has 7/8 litre of juice. Arjun drinks 3/4 litre. How much juice is left (in litres)? =
  25. 25.4/5 − 1/2 =
  26. 26.5/6 − 1/3 =
  27. 27.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? =
  28. 28.7/8 − 1/4 =
  29. 29.7/8 − 1/6 =
  30. 30.Riya has a ribbon 1/2 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  31. 31.A tank is 2/3 full of water. Then water filling 2/9 of the tank is used. What fraction of the tank is full now? =
  32. 32.1/2 − 4/9 =
  33. 33.1/2 − 2/7 =
  34. 34.A tank is 3/5 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  35. 35.Arjun has a ribbon 6/7 m long and cuts off 3/4 m. How long is the ribbon now (in m)? =
  36. 36.2/3 − 4/7 =
  37. 37.Vihaan has a ribbon 1/2 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  38. 38.1/5 − 1/10 =
  39. 39.3/5 − 1/6 =
  40. 40.3/4 − 2/3 =

Answer key

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

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