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Subtract 9/21 from 12/54

12/54 - 9/21 is -13/63.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 54 × 7 = 378,
    12/54 = 12 × 7/54 × 7 = 84/378
  3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
    9/21 = 9 × 18/21 × 18 = 162/378
  4. Subtract the two like fractions:
    84/378 - 162/378 = 84 - 162/378 = -78/378
  5. After reducing the fraction, the answer is -13/63

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