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Subtract Fractions with Different Denominators Worksheet

Fractions lesson 16: Subtracting fractions: different denominators · Set 622 · 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. 1.1/2 − 2/7 =
  2. 2.4/9 − 1/3 =
  3. 3.3/4 − 2/3 =
  4. 4.A bottle has 3/4 litre of juice. Vihaan drinks 1/7 litre. How much juice is left (in litres)? =
  5. 5.7/10 − 1/5 =
  6. 6.A bottle has 3/4 litre of juice. Vihaan drinks 2/5 litre. How much juice is left (in litres)? =
  7. 7.7/10 − 2/5 =
  8. 8.2/5 − 3/10 =
  9. 9.8/9 − 5/6 =
  10. 10.5/6 − 7/9 =
  11. 11.5/6 − 1/5 =
  12. 12.4/5 − 1/4 =
  13. 13.8/9 − 1/6 =
  14. 14.1/2 − 4/9 =
  15. 15.A bottle has 3/7 litre of juice. Anaya drinks 1/4 litre. How much juice is left (in litres)? =
  16. 16.A bottle has 6/7 litre of juice. Vihaan drinks 1/2 litre. How much juice is left (in litres)? =
  17. 17.A tank is 4/5 full of water. Then water filling 2/3 of the tank is used. What fraction of the tank is full now? =
  18. 18.3/4 − 4/7 =
  19. 19.1/2 − 1/9 =
  20. 20.A tank is 7/10 full of water. Then water filling 2/5 of the tank is used. What fraction of the tank is full now? =
  21. 21.Riya has a ribbon 1/2 m long and cuts off 4/9 m. How long is the ribbon now (in m)? =
  22. 22.5/7 − 1/4 =
  23. 23.2/5 − 1/4 =
  24. 24.3/4 − 5/8 =
  25. 25.Sara has a ribbon 7/9 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  26. 26.7/8 − 3/4 =
  27. 27.6/7 − 1/2 =
  28. 28.9/10 − 1/2 =
  29. 29.9/10 − 3/5 =
  30. 30.A bottle has 8/9 litre of juice. Meera drinks 1/2 litre. How much juice is left (in litres)? =
  31. 31.7/9 − 1/2 =
  32. 32.2/3 − 1/7 =
  33. 33.2/3 − 3/7 =
  34. 34.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? =
  35. 35.A bottle has 1/3 litre of juice. Aarav drinks 1/9 litre. How much juice is left (in litres)? =
  36. 36.1/3 − 3/10 =
  37. 37.A bottle has 4/5 litre of juice. Sara drinks 1/3 litre. How much juice is left (in litres)? =
  38. 38.Tara has a ribbon 6/7 m long and cuts off 2/3 m. How long is the ribbon now (in m)? =
  39. 39.6/7 − 2/3 =
  40. 40.1/6 − 1/10 =

Answer key

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

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