Subtract 27/7 from 81/12, Solve 6 9/12

Subtract 27/7 from 81/12

1^st number: 6 9/12, 2^nd number: 3 6/7

81/12 - 27/7 is 81/28.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 12 × 7 = 84,
81/12 = 81 × 7/12 × 7 = 567/84
Likewise, for the 2nd fraction, since 7 × 12 = 84,
27/7 = 27 × 12/7 × 12 = 324/84
Subtract the two like fractions:
567/84 - 324/84 = 567 - 324/84 = 243/84
After reducing the fraction, the answer is 81/28
In mixed form: 225/28

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