Subtract 27/7 from 12/27, Solve 12/27

Subtract 27/7 from 12/27

1^st number: 12/27, 2^nd number: 3 6/7

12/27 - 27/7 is -215/63.

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
For the 1st fraction, since 27 × 7 = 189,
12/27 = 12 × 7/27 × 7 = 84/189
Likewise, for the 2nd fraction, since 7 × 27 = 189,
27/7 = 27 × 27/7 × 27 = 729/189
Subtract the two like fractions:
84/189 - 729/189 = 84 - 729/189 = -645/189
After reducing the fraction, the answer is -215/63

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