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Subtract 1/18 from 21/27

21/27 - 1/18 is 13/18.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 18 is 54

    Next, find the equivalent fraction of both fractional numbers with denominator 54
  2. For the 1st fraction, since 27 × 2 = 54,
    21/27 = 21 × 2/27 × 2 = 42/54
  3. Likewise, for the 2nd fraction, since 18 × 3 = 54,
    1/18 = 1 × 3/18 × 3 = 3/54
  4. Subtract the two like fractions:
    42/54 - 3/54 = 42 - 3/54 = 39/54
  5. After reducing the fraction, the answer is 13/18

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