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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 717 · 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. 1.7/10 − 1/4 =
  2. 2.3/4 − 3/7 =
  3. 3.3/7 − 1/3 =
  4. 4.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? =
  5. 5.1/2 − 4/9 =
  6. 6.A tank is 9/10 full of water. Then water filling 1/5 of the tank is used. What fraction of the tank is full now? =
  7. 7.4/5 − 7/10 =
  8. 8.2/3 − 3/8 =
  9. 9.Meera has a ribbon 2/3 m long and cuts off 2/7 m. How long is the ribbon now (in m)? =
  10. 10.9/10 − 1/4 =
  11. 11.1/4 − 1/6 =
  12. 12.Sara has a ribbon 1/3 m long and cuts off 1/8 m. How long is the ribbon now (in m)? =
  13. 13.1/2 − 1/5 =
  14. 14.8/9 − 5/6 =
  15. 15.5/6 − 1/4 =
  16. 16.Kabir has a ribbon 1/4 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  17. 17.Rohan has a ribbon 2/3 m long and cuts off 1/7 m. How long is the ribbon now (in m)? =
  18. 18.A bottle has 3/4 litre of juice. Aarav drinks 5/7 litre. How much juice is left (in litres)? =
  19. 19.4/7 − 1/3 =
  20. 20.A bottle has 1/4 litre of juice. Kabir drinks 1/8 litre. How much juice is left (in litres)? =
  21. 21.8/9 − 2/3 =
  22. 22.3/5 − 1/3 =
  23. 23.A tank is 1/3 full of water. Then water filling 1/9 of the tank is used. What fraction of the tank is full now? =
  24. 24.A bottle has 7/8 litre of juice. Meera drinks 1/2 litre. How much juice is left (in litres)? =
  25. 25.Arjun has a ribbon 3/8 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  26. 26.7/9 − 2/3 =
  27. 27.5/6 − 1/8 =
  28. 28.5/6 − 5/8 =
  29. 29.5/7 − 1/4 =
  30. 30.3/4 − 1/2 =
  31. 31.5/9 − 1/3 =
  32. 32.A tank is 7/10 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  33. 33.1/3 − 1/9 =
  34. 34.7/10 − 1/6 =
  35. 35.Aarav has a ribbon 1/2 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =
  36. 36.Riya has a ribbon 2/3 m long and cuts off 2/9 m. How long is the ribbon now (in m)? =
  37. 37.A bottle has 4/9 litre of juice. Vihaan drinks 1/3 litre. How much juice is left (in litres)? =
  38. 38.2/3 − 3/5 =
  39. 39.A bottle has 3/8 litre of juice. Tara drinks 1/4 litre. How much juice is left (in litres)? =
  40. 40.Rohan has a ribbon 3/5 m long and cuts off 1/4 m. How long is the ribbon now (in m)? =

Answer key

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

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