Subtract 70/20 from 12/27, Solve 12/27

Subtract 70/20 from 12/27

1^st number: 12/27, 2^nd number: 3 10/20

12/27 - 70/20 is -55/18.

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

Next, find the equivalent fraction of both fractional numbers with denominator 540
For the 1st fraction, since 27 × 20 = 540,
12/27 = 12 × 20/27 × 20 = 240/540
Likewise, for the 2nd fraction, since 20 × 27 = 540,
70/20 = 70 × 27/20 × 27 = 1890/540
Subtract the two like fractions:
240/540 - 1890/540 = 240 - 1890/540 = -1650/540
After reducing the fraction, the answer is -55/18

MathStep (Works offline)

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