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Subtract 4/27 from 5/21

5/21 - 4/27 is 17/189.

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,
    5/21 = 5 × 9/21 × 9 = 45/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    4/27 = 4 × 7/27 × 7 = 28/189
  4. Subtract the two fractions:
    45/189 - 28/189 = 45 - 28/189 = 17/189

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