Subtract 54/12 from 3/81, Solve 3/81

Subtract 54/12 from 3/81

1^st number: 3/81, 2^nd number: 4 6/12

3/81 - 54/12 is -241/54.

Find the least common denominator or LCM of the two denominators:
LCM of 81 and 12 is 324

Next, find the equivalent fraction of both fractional numbers with denominator 324
For the 1st fraction, since 81 × 4 = 324,
3/81 = 3 × 4/81 × 4 = 12/324
Likewise, for the 2nd fraction, since 12 × 27 = 324,
54/12 = 54 × 27/12 × 27 = 1458/324
Subtract the two like fractions:
12/324 - 1458/324 = 12 - 1458/324 = -1446/324
After reducing the fraction, the answer is -241/54

MathStep (Works offline)

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