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Subtract 28/81 from 27/80

27/80 - 28/81 is -53/6480.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 80 and 81 is 6480

    Next, find the equivalent fraction of both fractional numbers with denominator 6480
  2. For the 1st fraction, since 80 × 81 = 6480,
    27/80 = 27 × 81/80 × 81 = 2187/6480
  3. Likewise, for the 2nd fraction, since 81 × 80 = 6480,
    28/81 = 28 × 80/81 × 80 = 2240/6480
  4. Subtract the two like fractions:
    2187/6480 - 2240/6480 = 2187 - 2240/6480 = -53/6480

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