Subtract 84/81 from 28/48, Solve 28/48

Subtract 84/81 from 28/48

1^st number: 28/48, 2^nd number: 1 3/81

28/48 - 84/81 is -49/108.

Find the least common denominator or LCM of the two denominators:
LCM of 48 and 81 is 1296

Next, find the equivalent fraction of both fractional numbers with denominator 1296
For the 1st fraction, since 48 × 27 = 1296,
28/48 = 28 × 27/48 × 27 = 756/1296
Likewise, for the 2nd fraction, since 81 × 16 = 1296,
84/81 = 84 × 16/81 × 16 = 1344/1296
Subtract the two like fractions:
756/1296 - 1344/1296 = 756 - 1344/1296 = -588/1296
After reducing the fraction, the answer is -49/108

MathStep (Works offline)

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