Subtract 24/21 from 12/27, Solve 12/27

Subtract 24/21 from 12/27

1^st number: 12/27, 2^nd number: 1 3/21

12/27 - 24/21 is -44/63.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 27 × 7 = 189,
12/27 = 12 × 7/27 × 7 = 84/189
Likewise, for the 2nd fraction, since 21 × 9 = 189,
24/21 = 24 × 9/21 × 9 = 216/189
Subtract the two like fractions:
84/189 - 216/189 = 84 - 216/189 = -132/189
After reducing the fraction, the answer is -44/63

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