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Subtract 30/27 from 21/7

1st number: 3 0/7, 2nd number: 1 3/27

21/7 - 30/27 is 17/9.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 189
  2. For the 1st fraction, since 7 × 27 = 189,
    21/7 = 21 × 27/7 × 27 = 567/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    30/27 = 30 × 7/27 × 7 = 210/189
  4. Subtract the two like fractions:
    567/189 - 210/189 = 567 - 210/189 = 357/189
  5. After reducing the fraction, the answer is 17/9
  6. In mixed form: 18/9

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