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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 392 · 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 9/10 full of water. Then water filling 3/4 of the tank is used. What fraction of the tank is full now? =
  2. 2.1/2 − 4/9 =
  3. 3.5/6 − 2/5 =
  4. 4.A tank is 3/4 full of water. Then water filling 5/7 of the tank is used. What fraction of the tank is full now? =
  5. 5.Meera has a ribbon 5/6 m long and cuts off 5/9 m. How long is the ribbon now (in m)? =
  6. 6.1/6 − 1/8 =
  7. 7.8/9 − 2/3 =
  8. 8.1/2 − 2/9 =
  9. 9.1/2 − 1/6 =
  10. 10.9/10 − 3/5 =
  11. 11.3/5 − 3/10 =
  12. 12.4/5 − 3/4 =
  13. 13.1/2 − 3/8 =
  14. 14.A bottle has 2/5 litre of juice. Ishaan drinks 3/10 litre. How much juice is left (in litres)? =
  15. 15.1/2 − 1/5 =
  16. 16.A bottle has 1/2 litre of juice. Sara drinks 1/7 litre. How much juice is left (in litres)? =
  17. 17.A bottle has 7/8 litre of juice. Vihaan drinks 1/3 litre. How much juice is left (in litres)? =
  18. 18.2/3 − 1/6 =
  19. 19.3/7 − 1/3 =
  20. 20.1/3 − 1/7 =
  21. 21.5/8 − 1/2 =
  22. 22.A bottle has 2/3 litre of juice. Ishaan drinks 4/7 litre. How much juice is left (in litres)? =
  23. 23.1/5 − 1/6 =
  24. 24.5/6 − 4/9 =
  25. 25.A bottle has 9/10 litre of juice. Meera drinks 4/5 litre. How much juice is left (in litres)? =
  26. 26.Aarav has a ribbon 4/9 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  27. 27.A tank is 4/7 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  28. 28.Aarav has a ribbon 6/7 m long and cuts off 1/3 m. How long is the ribbon now (in m)? =
  29. 29.3/4 − 2/5 =
  30. 30.3/7 − 1/4 =
  31. 31.5/9 − 1/3 =
  32. 32.Vihaan has a ribbon 9/10 m long and cuts off 3/4 m. How long is the ribbon now (in m)? =
  33. 33.2/3 − 3/5 =
  34. 34.9/10 − 1/2 =
  35. 35.A bottle has 1/2 litre of juice. Diya drinks 4/9 litre. How much juice is left (in litres)? =
  36. 36.5/7 − 1/2 =
  37. 37.3/5 − 1/4 =
  38. 38.2/3 − 3/10 =
  39. 39.9/10 − 2/3 =
  40. 40.A tank is 5/9 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =

Answer key

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

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