Subtract 7/27 from 28/20, Solve 1 8/20

Subtract 7/27 from 28/20

1^st number: 1 8/20, 2^nd number: 7/27

28/20 - 7/27 is 154/135.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 27 is 540

Next, find the equivalent fraction of both fractional numbers with denominator 540
For the 1st fraction, since 20 × 27 = 540,
28/20 = 28 × 27/20 × 27 = 756/540
Likewise, for the 2nd fraction, since 27 × 20 = 540,
7/27 = 7 × 20/27 × 20 = 140/540
Subtract the two like fractions:
756/540 - 140/540 = 756 - 140/540 = 616/540
After reducing the fraction, the answer is 154/135
In mixed form: 119/135

MathStep (Works offline)

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