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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 78 · 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.Ishaan has a ribbon 4/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  2. 2.5/6 − 4/9 =
  3. 3.A tank is 4/7 full of water. Then water filling 1/4 of the tank is used. What fraction of the tank is full now? =
  4. 4.6/7 − 1/3 =
  5. 5.4/5 − 1/3 =
  6. 6.A bottle has 1/3 litre of juice. Sara drinks 2/9 litre. How much juice is left (in litres)? =
  7. 7.A tank is 1/2 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  8. 8.A bottle has 7/8 litre of juice. Ishaan drinks 1/4 litre. How much juice is left (in litres)? =
  9. 9.1/3 − 3/10 =
  10. 10.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? =
  11. 11.2/3 − 1/5 =
  12. 12.A bottle has 5/6 litre of juice. Rohan drinks 1/8 litre. How much juice is left (in litres)? =
  13. 13.3/4 − 3/8 =
  14. 14.A tank is 3/4 full of water. Then water filling 1/8 of the tank is used. What fraction of the tank is full now? =
  15. 15.A bottle has 1/5 litre of juice. Vihaan drinks 1/6 litre. How much juice is left (in litres)? =
  16. 16.1/3 − 1/6 =
  17. 17.9/10 − 3/4 =
  18. 18.8/9 − 2/3 =
  19. 19.A tank is 8/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  20. 20.5/8 − 1/3 =
  21. 21.3/5 − 1/4 =
  22. 22.A bottle has 6/7 litre of juice. Rohan drinks 2/3 litre. How much juice is left (in litres)? =
  23. 23.2/3 − 2/9 =
  24. 24.5/8 − 1/2 =
  25. 25.4/7 − 1/3 =
  26. 26.8/9 − 1/2 =
  27. 27.A bottle has 5/6 litre of juice. Tara drinks 3/8 litre. How much juice is left (in litres)? =
  28. 28.7/9 − 1/6 =
  29. 29.4/5 − 2/3 =
  30. 30.3/4 − 3/7 =
  31. 31.3/4 − 3/5 =
  32. 32.3/10 − 1/5 =
  33. 33.Tara has a ribbon 1/6 m long and cuts off 1/9 m. How long is the ribbon now (in m)? =
  34. 34.A bottle has 7/10 litre of juice. Meera drinks 3/5 litre. How much juice is left (in litres)? =
  35. 35.A bottle has 2/3 litre of juice. Aarav drinks 1/4 litre. How much juice is left (in litres)? =
  36. 36.6/7 − 2/3 =
  37. 37.A tank is 1/2 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 8/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  39. 39.6/7 − 3/4 =
  40. 40.7/10 − 2/3 =

Answer key

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

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