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Subtract 3/54 from 1/21

1/21 - 3/54 is -1/126.

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,
    1/21 = 1 × 18/21 × 18 = 18/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    3/54 = 3 × 7/54 × 7 = 21/378
  4. Subtract the two like fractions:
    18/378 - 21/378 = 18 - 21/378 = -3/378
  5. After reducing the fraction, the answer is -1/126

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