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Subtract 10/27 from 4/21

4/21 - 10/27 is -34/189.

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,
    4/21 = 4 × 9/21 × 9 = 36/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    10/27 = 10 × 7/27 × 7 = 70/189
  4. Subtract the two fractions:
    36/189 - 70/189 = 36 - 70/189 = -34/189

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