Subtract 48/27 from 21/12, Solve 1 9/12

Subtract 48/27 from 21/12

1^st number: 1 9/12, 2^nd number: 1 21/27

21/12 - 48/27 is -1/36.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 27 is 108

Next, find the equivalent fraction of both fractional numbers with denominator 108
For the 1st fraction, since 12 × 9 = 108,
21/12 = 21 × 9/12 × 9 = 189/108
Likewise, for the 2nd fraction, since 27 × 4 = 108,
48/27 = 48 × 4/27 × 4 = 192/108
Subtract the two like fractions:
189/108 - 192/108 = 189 - 192/108 = -3/108
After reducing the fraction, the answer is -1/36

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