Subtract 90/27 from 81/6, Solve 13 3/6

Subtract 90/27 from 81/6

1^st number: 13 3/6, 2^nd number: 3 9/27

81/6 - 90/27 is 61/6.

Find the least common denominator or LCM of the two denominators:
LCM of 6 and 27 is 54

Next, find the equivalent fraction of both fractional numbers with denominator 54
For the 1st fraction, since 6 × 9 = 54,
81/6 = 81 × 9/6 × 9 = 729/54
Likewise, for the 2nd fraction, since 27 × 2 = 54,
90/27 = 90 × 2/27 × 2 = 180/54
Subtract the two like fractions:
729/54 - 180/54 = 729 - 180/54 = 549/54
After reducing the fraction, the answer is 61/6
In mixed form: 101/6

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad