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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 757 · 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. 1.9/10 − 2/5 =
  2. 2.A tank is 1/2 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  3. 3.9/10 − 1/2 =
  4. 4.1/2 − 2/5 =
  5. 5.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? =
  6. 6.A bottle has 1/6 litre of juice. Sara drinks 1/9 litre. How much juice is left (in litres)? =
  7. 7.A bottle has 3/7 litre of juice. Kabir drinks 1/4 litre. How much juice is left (in litres)? =
  8. 8.A tank is 3/4 full of water. Then water filling 3/5 of the tank is used. What fraction of the tank is full now? =
  9. 9.3/5 − 1/10 =
  10. 10.7/9 − 1/2 =
  11. 11.1/2 − 1/7 =
  12. 12.3/4 − 1/10 =
  13. 13.A tank is 5/6 full of water. Then water filling 7/9 of the tank is used. What fraction of the tank is full now? =
  14. 14.5/8 − 1/6 =
  15. 15.3/4 − 3/10 =
  16. 16.A tank is 2/3 full of water. Then water filling 4/7 of the tank is used. What fraction of the tank is full now? =
  17. 17.A bottle has 5/8 litre of juice. Ishaan drinks 1/3 litre. How much juice is left (in litres)? =
  18. 18.A tank is 1/3 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  19. 19.Kabir has a ribbon 1/3 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  20. 20.4/9 − 1/3 =
  21. 21.A bottle has 1/2 litre of juice. Vihaan drinks 1/4 litre. How much juice is left (in litres)? =
  22. 22.A bottle has 6/7 litre of juice. Riya drinks 2/3 litre. How much juice is left (in litres)? =
  23. 23.1/3 − 1/7 =
  24. 24.A tank is 4/9 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  25. 25.1/6 − 1/9 =
  26. 26.6/7 − 1/3 =
  27. 27.A tank is 1/3 full of water. Then water filling 3/10 of the tank is used. What fraction of the tank is full now? =
  28. 28.A bottle has 2/3 litre of juice. Kabir drinks 1/8 litre. How much juice is left (in litres)? =
  29. 29.A bottle has 3/4 litre of juice. Rohan drinks 5/7 litre. How much juice is left (in litres)? =
  30. 30.3/8 − 1/4 =
  31. 31.2/7 − 1/4 =
  32. 32.3/8 − 1/3 =
  33. 33.A tank is 3/4 full of water. Then water filling 1/7 of the tank is used. What fraction of the tank is full now? =
  34. 34.A bottle has 3/4 litre of juice. Kabir drinks 7/10 litre. How much juice is left (in litres)? =
  35. 35.3/7 − 1/4 =
  36. 36.A bottle has 8/9 litre of juice. Anaya drinks 1/3 litre. How much juice is left (in litres)? =
  37. 37.A bottle has 3/4 litre of juice. Riya drinks 4/7 litre. How much juice is left (in litres)? =
  38. 38.A tank is 5/6 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  39. 39.1/4 − 1/7 =
  40. 40.7/10 − 3/5 =

Answer key

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

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