Subtract 80/7 from 30/54, Solve 30/54

Subtract 80/7 from 30/54

1^st number: 30/54, 2^nd number: 11 3/7

30/54 - 80/7 is -685/63.

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,
30/54 = 30 × 7/54 × 7 = 210/378
Likewise, for the 2nd fraction, since 7 × 54 = 378,
80/7 = 80 × 54/7 × 54 = 4320/378
Subtract the two like fractions:
210/378 - 4320/378 = 210 - 4320/378 = -4110/378
After reducing the fraction, the answer is -685/63

MathStep (Works offline)

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