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Subtract 7/81 from 1/20

1/20 - 7/81 is -59/1620.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 81 is 1620

    Next, find the equivalent fraction of both fractional numbers with denominator 1620
  2. For the 1st fraction, since 20 × 81 = 1620,
    1/20 = 1 × 81/20 × 81 = 81/1620
  3. Likewise, for the 2nd fraction, since 81 × 20 = 1620,
    7/81 = 7 × 20/81 × 20 = 140/1620
  4. Subtract the two like fractions:
    81/1620 - 140/1620 = 81 - 140/1620 = -59/1620

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