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Subtract 6/21 from 3/54

3/54 - 6/21 is -29/126.

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,
    3/54 = 3 × 7/54 × 7 = 21/378
  3. Likewise, for the 2nd fraction, since 21 × 18 = 378,
    6/21 = 6 × 18/21 × 18 = 108/378
  4. Subtract the two like fractions:
    21/378 - 108/378 = 21 - 108/378 = -87/378
  5. After reducing the fraction, the answer is -29/126

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