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Subtract 20/27 from 10/21

10/21 - 20/27 is -50/189.

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,
    10/21 = 10 × 9/21 × 9 = 90/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    20/27 = 20 × 7/27 × 7 = 140/189
  4. Subtract the two fractions:
    90/189 - 140/189 = 90 - 140/189 = -50/189

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