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Subtract 4/54 from 5/21

5/21 - 4/54 is 31/189.

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,
    5/21 = 5 × 18/21 × 18 = 90/378
  3. Likewise, for the 2nd fraction, since 54 × 7 = 378,
    4/54 = 4 × 7/54 × 7 = 28/378
  4. Subtract the two like fractions:
    90/378 - 28/378 = 90 - 28/378 = 62/378
  5. After reducing the fraction, the answer is 31/189

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