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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 643 · 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 bottle has 7/9 litre of juice. Rohan drinks 2/3 litre. How much juice is left (in litres)? =
  2. 2.A bottle has 9/10 litre of juice. Sara drinks 1/5 litre. How much juice is left (in litres)? =
  3. 3.A bottle has 2/5 litre of juice. Sara drinks 1/10 litre. How much juice is left (in litres)? =
  4. 4.5/6 − 4/5 =
  5. 5.6/7 − 1/4 =
  6. 6.Kabir has a ribbon 9/10 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  7. 7.7/9 − 1/3 =
  8. 8.1/2 − 2/9 =
  9. 9.8/9 − 1/2 =
  10. 10.2/3 − 2/5 =
  11. 11.7/8 − 1/3 =
  12. 12.9/10 − 3/5 =
  13. 13.4/5 − 3/4 =
  14. 14.Rohan has a ribbon 1/4 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  15. 15.A tank is 3/4 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  16. 16.A bottle has 3/4 litre of juice. Ishaan drinks 4/7 litre. How much juice is left (in litres)? =
  17. 17.A bottle has 2/3 litre of juice. Meera drinks 1/10 litre. How much juice is left (in litres)? =
  18. 18.5/6 − 1/9 =
  19. 19.A bottle has 5/6 litre of juice. Meera drinks 1/8 litre. How much juice is left (in litres)? =
  20. 20.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? =
  21. 21.Vihaan has a ribbon 3/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  22. 22.4/9 − 1/3 =
  23. 23.6/7 − 1/2 =
  24. 24.2/3 − 4/7 =
  25. 25.6/7 − 3/4 =
  26. 26.Vihaan has a ribbon 2/3 m long and cuts off 4/7 m. How long is the ribbon now (in m)? =
  27. 27.A bottle has 4/7 litre of juice. Vihaan drinks 1/2 litre. How much juice is left (in litres)? =
  28. 28.6/7 − 2/3 =
  29. 29.Sara has a ribbon 2/3 m long and cuts off 5/8 m. How long is the ribbon now (in m)? =
  30. 30.Sara has a ribbon 7/8 m long and cuts off 1/6 m. How long is the ribbon now (in m)? =
  31. 31.Riya has a ribbon 2/3 m long and cuts off 3/10 m. How long is the ribbon now (in m)? =
  32. 32.4/5 − 2/3 =
  33. 33.A tank is 2/5 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  34. 34.9/10 − 1/2 =
  35. 35.3/4 − 2/5 =
  36. 36.3/4 − 3/7 =
  37. 37.7/10 − 1/5 =
  38. 38.A bottle has 3/5 litre of juice. Kabir drinks 1/10 litre. How much juice is left (in litres)? =
  39. 39.2/3 − 3/7 =
  40. 40.3/4 − 2/7 =

Answer key

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

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