Subtract 28/27 from 30/35, Solve 30/35

Subtract 28/27 from 30/35

1^st number: 30/35, 2^nd number: 1 1/27

30/35 - 28/27 is -34/189.

Find the least common denominator or LCM of the two denominators:
LCM of 35 and 27 is 945

Next, find the equivalent fraction of both fractional numbers with denominator 945
For the 1st fraction, since 35 × 27 = 945,
30/35 = 30 × 27/35 × 27 = 810/945
Likewise, for the 2nd fraction, since 27 × 35 = 945,
28/27 = 28 × 35/27 × 35 = 980/945
Subtract the two like fractions:
810/945 - 980/945 = 810 - 980/945 = -170/945
After reducing the fraction, the answer is -34/189

MathStep (Works offline)

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