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Subtract 9/7 from 21/27

1st number: 21/27, 2nd number: 1 2/7

21/27 - 9/7 is -32/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 7 is 189

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 27 × 7 = 189,
    21/27 = 21 × 7/27 × 7 = 147/189
  3. Likewise, for the 2nd fraction, since 7 × 27 = 189,
    9/7 = 9 × 27/7 × 27 = 243/189
  4. Subtract the two like fractions:
    147/189 - 243/189 = 147 - 243/189 = -96/189
  5. After reducing the fraction, the answer is -32/63

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