Subtract 98/80 from 28/54, Solve 28/54

Subtract 98/80 from 28/54

1^st number: 28/54, 2^nd number: 1 18/80

28/54 - 98/80 is -763/1080.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 80 is 2160

Next, find the equivalent fraction of both fractional numbers with denominator 2160
For the 1st fraction, since 54 × 40 = 2160,
28/54 = 28 × 40/54 × 40 = 1120/2160
Likewise, for the 2nd fraction, since 80 × 27 = 2160,
98/80 = 98 × 27/80 × 27 = 2646/2160
Subtract the two like fractions:
1120/2160 - 2646/2160 = 1120 - 2646/2160 = -1526/2160
After reducing the fraction, the answer is -763/1080

MathStep (Works offline)

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