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Subtract 8/81 from 81/90

81/90 - 8/81 is 649/810.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 81 is 810

    Next, find the equivalent fraction of both fractional numbers with denominator 810
  2. For the 1st fraction, since 90 × 9 = 810,
    81/90 = 81 × 9/90 × 9 = 729/810
  3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
    8/81 = 8 × 10/81 × 10 = 80/810
  4. Subtract the two like fractions:
    729/810 - 80/810 = 729 - 80/810 = 649/810

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