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Subtract 1/8 from 21/54

21/54 - 1/8 is 19/72.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 54 and 8 is 216

    Next, find the equivalent fraction of both fractional numbers with denominator 216
  2. For the 1st fraction, since 54 × 4 = 216,
    21/54 = 21 × 4/54 × 4 = 84/216
  3. Likewise, for the 2nd fraction, since 8 × 27 = 216,
    1/8 = 1 × 27/8 × 27 = 27/216
  4. Subtract the two like fractions:
    84/216 - 27/216 = 84 - 27/216 = 57/216
  5. After reducing the fraction, the answer is 19/72

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