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Subtract 21/27 from 5/6

5/6 - 21/27 is 1/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 6 and 27 is 54

    Next, find the equivalent fraction of both fractional numbers with denominator 54
  2. For the 1st fraction, since 6 × 9 = 54,
    5/6 = 5 × 9/6 × 9 = 45/54
  3. Likewise, for the 2nd fraction, since 27 × 2 = 54,
    21/27 = 21 × 2/27 × 2 = 42/54
  4. Subtract the two like fractions:
    45/54 - 42/54 = 45 - 42/54 = 3/54
  5. After reducing the fraction, the answer is 1/18

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