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Subtract 20/81 from 42/27

1st number: 1 15/27, 2nd number: 20/81

42/27 - 20/81 is 106/81.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 81 is 81

    Next, find the equivalent fraction of both fractional numbers with denominator 81
  2. For the 1st fraction, since 27 × 3 = 81,
    42/27 = 42 × 3/27 × 3 = 126/81
  3. Likewise, for the 2nd fraction, since 81 × 1 = 81,
    20/81 = 20 × 1/81 × 1 = 20/81
  4. Subtract the two like fractions:
    126/81 - 20/81 = 126 - 20/81 = 106/81
  5. In mixed form: 125/81

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