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Subtract 90/63 from 21/54

1st number: 21/54, 2nd number: 1 27/63

21/54 - 90/63 is -131/126.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 63 is 378

    Next, find the equivalent fraction of both fractional numbers with denominator 378
  2. For the 1st fraction, since 54 × 7 = 378,
    21/54 = 21 × 7/54 × 7 = 147/378
  3. Likewise, for the 2nd fraction, since 63 × 6 = 378,
    90/63 = 90 × 6/63 × 6 = 540/378
  4. Subtract the two like fractions:
    147/378 - 540/378 = 147 - 540/378 = -393/378
  5. After reducing the fraction, the answer is -131/126

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