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Subtract 7/27 from 18/21

18/21 - 7/27 is 113/189.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 27 is 189
  2. For the 1st fraction, since 21 × 9 = 189,
    18/21 = 18 × 9/21 × 9 = 162/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    7/27 = 7 × 7/27 × 7 = 49/189
  4. Subtract the two fractions:
    162/189 - 49/189 = 162 - 49/189 = 113/189

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