Subtract 30/27 from 20/56, Solve 20/56

Subtract 30/27 from 20/56

1^st number: 20/56, 2^nd number: 1 3/27

20/56 - 30/27 is -95/126.

Find the least common denominator or LCM of the two denominators:
LCM of 56 and 27 is 1512

Next, find the equivalent fraction of both fractional numbers with denominator 1512
For the 1st fraction, since 56 × 27 = 1512,
20/56 = 20 × 27/56 × 27 = 540/1512
Likewise, for the 2nd fraction, since 27 × 56 = 1512,
30/27 = 30 × 56/27 × 56 = 1680/1512
Subtract the two like fractions:
540/1512 - 1680/1512 = 540 - 1680/1512 = -1140/1512
After reducing the fraction, the answer is -95/126

MathStep (Works offline)

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