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Subtract 1/54 from 12/21

12/21 - 1/54 is 209/378.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 54 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 21 × 18 = 378,
    12/21 = 12 × 18/21 × 18 = 216/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    1/54 = 1 × 7/54 × 7 = 7/378
  4. Subtract the two like fractions:
    216/378 - 7/378 = 216 - 7/378 = 209/378

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