Subtract 28/7 from 1/54, Solve 1/54

Subtract 28/7 from 1/54

1^st number: 1/54, 2^nd number: 4 0/7

1/54 - 28/7 is -215/54.

Find the least common denominator or LCM of the two denominators:
LCM of 54 and 7 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 54 × 7 = 378,
1/54 = 1 × 7/54 × 7 = 7/378
Likewise, for the 2nd fraction, since 7 × 54 = 378,
28/7 = 28 × 54/7 × 54 = 1512/378
Subtract the two like fractions:
7/378 - 1512/378 = 7 - 1512/378 = -1505/378
After reducing the fraction, the answer is -215/54

MathStep (Works offline)

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