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Subtract 21/81 from 6/49

6/49 - 21/81 is -181/1323.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 49 and 81 is 3969

    Next, find the equivalent fraction of both fractional numbers with denominator 3969
  2. For the 1st fraction, since 49 × 81 = 3969,
    6/49 = 6 × 81/49 × 81 = 486/3969
  3. Likewise, for the 2nd fraction, since 81 × 49 = 3969,
    21/81 = 21 × 49/81 × 49 = 1029/3969
  4. Subtract the two like fractions:
    486/3969 - 1029/3969 = 486 - 1029/3969 = -543/3969
  5. After reducing the fraction, the answer is -181/1323

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