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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 170 · 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.Ishaan has a ribbon 3/4 m long and cuts off 3/5 m. How long is the ribbon now (in m)? =
  2. 2.A bottle has 2/5 litre of juice. Sara drinks 3/10 litre. How much juice is left (in litres)? =
  3. 3.2/3 − 3/7 =
  4. 4.3/4 − 1/7 =
  5. 5.2/3 − 4/9 =
  6. 6.7/9 − 1/3 =
  7. 7.8/9 − 1/3 =
  8. 8.A bottle has 5/7 litre of juice. Tara drinks 2/3 litre. How much juice is left (in litres)? =
  9. 9.3/4 − 3/8 =
  10. 10.1/2 − 2/9 =
  11. 11.A bottle has 4/5 litre of juice. Ishaan drinks 1/10 litre. How much juice is left (in litres)? =
  12. 12.2/3 − 1/7 =
  13. 13.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? =
  14. 14.1/4 − 1/7 =
  15. 15.A tank is 5/9 full of water. Then water filling 1/2 of the tank is used. What fraction of the tank is full now? =
  16. 16.5/6 − 1/8 =
  17. 17.1/4 − 1/6 =
  18. 18.1/2 − 3/8 =
  19. 19.3/4 − 3/7 =
  20. 20.7/9 − 2/3 =
  21. 21.A bottle has 1/2 litre of juice. Vihaan drinks 1/8 litre. How much juice is left (in litres)? =
  22. 22.A tank is 1/4 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  23. 23.2/3 − 5/9 =
  24. 24.A tank is 1/2 full of water. Then water filling 1/10 of the tank is used. What fraction of the tank is full now? =
  25. 25.A bottle has 4/5 litre of juice. Ishaan drinks 1/3 litre. How much juice is left (in litres)? =
  26. 26.A tank is 7/9 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  27. 27.A bottle has 1/3 litre of juice. Kabir drinks 1/8 litre. How much juice is left (in litres)? =
  28. 28.5/6 − 1/5 =
  29. 29.1/3 − 2/7 =
  30. 30.1/3 − 3/10 =
  31. 31.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? =
  32. 32.7/9 − 1/2 =
  33. 33.A tank is 1/3 full of water. Then water filling 1/6 of the tank is used. What fraction of the tank is full now? =
  34. 34.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? =
  35. 35.A bottle has 2/5 litre of juice. Tara drinks 1/4 litre. How much juice is left (in litres)? =
  36. 36.6/7 − 1/4 =
  37. 37.3/8 − 1/4 =
  38. 38.1/2 − 4/9 =
  39. 39.A tank is 5/6 full of water. Then water filling 1/3 of the tank is used. What fraction of the tank is full now? =
  40. 40.8/9 − 1/6 =

Answer key

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

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