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Subtract 1/81 from 5/42

5/42 - 1/81 is 121/1134.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 81 is 1134
  2. For the 1st fraction, since 42 × 27 = 1134,
    5/42 = 5 × 27/42 × 27 = 135/1134
  3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
    1/81 = 1 × 14/81 × 14 = 14/1134
  4. Subtract the two fractions:
    135/1134 - 14/1134 = 135 - 14/1134 = 121/1134

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