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

Subtract 20/8 from 7/27

1^st number: 7/27, 2^nd number: 2 4/8

7/27 - 20/8 is -121/54.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 8 is 216

Next, find the equivalent fraction of both fractional numbers with denominator 216
For the 1st fraction, since 27 × 8 = 216,
7/27 = 7 × 8/27 × 8 = 56/216
Likewise, for the 2nd fraction, since 8 × 27 = 216,
20/8 = 20 × 27/8 × 27 = 540/216
Subtract the two like fractions:
56/216 - 540/216 = 56 - 540/216 = -484/216
After reducing the fraction, the answer is -121/54

MathStep (Works offline)

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