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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 470 · 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.Sara has a ribbon 3/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  2. 2.A tank is 2/3 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  3. 3.A bottle has 2/3 litre of juice. Kabir drinks 3/7 litre. How much juice is left (in litres)? =
  4. 4.5/9 − 1/6 =
  5. 5.5/6 − 7/9 =
  6. 6.9/10 − 1/4 =
  7. 7.3/5 − 1/2 =
  8. 8.5/6 − 2/3 =
  9. 9.A tank is 1/6 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  10. 10.A bottle has 5/6 litre of juice. Riya drinks 2/9 litre. How much juice is left (in litres)? =
  11. 11.1/2 − 3/8 =
  12. 12.3/4 − 5/7 =
  13. 13.A tank is 2/3 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  14. 14.A tank is 2/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  15. 15.7/9 − 1/2 =
  16. 16.A bottle has 5/6 litre of juice. Arjun drinks 1/3 litre. How much juice is left (in litres)? =
  17. 17.1/3 − 1/5 =
  18. 18.A tank is 4/5 full of water. Then water filling 7/10 of the tank is used. What fraction of the tank is full now? =
  19. 19.3/5 − 1/10 =
  20. 20.7/10 − 3/5 =
  21. 21.A bottle has 1/2 litre of juice. Arjun drinks 1/5 litre. How much juice is left (in litres)? =
  22. 22.Sara has a ribbon 1/2 m long and cuts off 3/7 m. How long is the ribbon now (in m)? =
  23. 23.A tank is 7/8 full of water. Then water filling 5/6 of the tank is used. What fraction of the tank is full now? =
  24. 24.4/5 − 1/10 =
  25. 25.2/3 − 1/4 =
  26. 26.7/8 − 1/4 =
  27. 27.1/3 − 3/10 =
  28. 28.8/9 − 2/3 =
  29. 29.5/6 − 1/8 =
  30. 30.2/3 − 1/9 =
  31. 31.A tank is 7/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  32. 32.Sara has a ribbon 5/6 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  33. 33.4/5 − 1/2 =
  34. 34.1/2 − 1/5 =
  35. 35.5/9 − 1/2 =
  36. 36.A bottle has 4/7 litre of juice. Anaya drinks 1/4 litre. How much juice is left (in litres)? =
  37. 37.A tank is 2/3 full of water. Then water filling 4/9 of the tank is used. What fraction of the tank is full now? =
  38. 38.A tank is 7/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  39. 39.Aarav has a ribbon 2/3 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  40. 40.4/9 − 1/6 =

Answer key

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

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