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Subtract 4/21 from 1/81

1/81 - 4/21 is -101/567.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 81 and 21 is 567

    Next, find the equivalent fraction of both fractional numbers with denominator 567
  2. For the 1st fraction, since 81 × 7 = 567,
    1/81 = 1 × 7/81 × 7 = 7/567
  3. Likewise, for the 2nd fraction, since 21 × 27 = 567,
    4/21 = 4 × 27/21 × 27 = 108/567
  4. Subtract the two like fractions:
    7/567 - 108/567 = 7 - 108/567 = -101/567

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