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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 145 · 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. 1.7/9 − 2/3 =
  2. 2.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? =
  3. 3.1/2 − 2/5 =
  4. 4.Rohan has a ribbon 3/4 m long and cuts off 5/7 m. How long is the ribbon now (in m)? =
  5. 5.Ishaan has a ribbon 2/3 m long and cuts off 3/8 m. How long is the ribbon now (in m)? =
  6. 6.3/5 − 1/2 =
  7. 7.3/4 − 1/2 =
  8. 8.Ishaan has a ribbon 6/7 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  9. 9.3/5 − 3/10 =
  10. 10.Vihaan has a ribbon 8/9 m long and cuts off 5/6 m. How long is the ribbon now (in m)? =
  11. 11.5/6 − 7/9 =
  12. 12.2/3 − 1/4 =
  13. 13.1/2 − 2/9 =
  14. 14.A tank is 2/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  15. 15.2/5 − 1/10 =
  16. 16.5/6 − 5/9 =
  17. 17.A tank is 9/10 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  18. 18.9/10 − 1/2 =
  19. 19.A bottle has 3/4 litre of juice. Diya drinks 4/7 litre. How much juice is left (in litres)? =
  20. 20.Ishaan has a ribbon 2/3 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  21. 21.A tank is 4/5 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  22. 22.4/7 − 1/3 =
  23. 23.3/8 − 1/6 =
  24. 24.A bottle has 7/8 litre of juice. Kabir drinks 5/6 litre. How much juice is left (in litres)? =
  25. 25.A tank is 8/9 full of water. Then water filling 5/6 of the tank is used. What fraction of the tank is full now? =
  26. 26.2/3 − 1/8 =
  27. 27.1/5 − 1/6 =
  28. 28.A bottle has 1/6 litre of juice. Ishaan drinks 1/10 litre. How much juice is left (in litres)? =
  29. 29.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? =
  30. 30.7/9 − 1/2 =
  31. 31.A tank is 1/3 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  32. 32.2/3 − 1/10 =
  33. 33.1/2 − 4/9 =
  34. 34.A bottle has 7/10 litre of juice. Sara drinks 2/5 litre. How much juice is left (in litres)? =
  35. 35.A bottle has 3/8 litre of juice. Arjun drinks 1/4 litre. How much juice is left (in litres)? =
  36. 36.1/2 − 2/7 =
  37. 37.A bottle has 3/4 litre of juice. Tara drinks 3/5 litre. How much juice is left (in litres)? =
  38. 38.6/7 − 1/2 =
  39. 39.3/4 − 3/5 =
  40. 40.3/5 − 1/3 =

Answer key

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

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