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Subtract 3/81 from 21/30

21/30 - 3/81 is 179/270.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 81 is 810

    Next, find the equivalent fraction of both fractional numbers with denominator 810
  2. For the 1st fraction, since 30 × 27 = 810,
    21/30 = 21 × 27/30 × 27 = 567/810
  3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
    3/81 = 3 × 10/81 × 10 = 30/810
  4. Subtract the two like fractions:
    567/810 - 30/810 = 567 - 30/810 = 537/810
  5. After reducing the fraction, the answer is 179/270

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