Subtract 15/21 from 54/27, Solve 2 0/27

Subtract 15/21 from 54/27

1^st number: 2 0/27, 2^nd number: 15/21

54/27 - 15/21 is 9/7.

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,
54/27 = 54 × 7/27 × 7 = 378/189
Likewise, for the 2nd fraction, since 21 × 9 = 189,
15/21 = 15 × 9/21 × 9 = 135/189
Subtract the two like fractions:
378/189 - 135/189 = 378 - 135/189 = 243/189
After reducing the fraction, the answer is 9/7
In mixed form: 12/7

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