Subtract 6/12 from 20/70, Solve 20/70

Subtract 6/12 from 20/70

20/70 - 6/12 is -3/14.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 12 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 70 × 6 = 420,
20/70 = 20 × 6/70 × 6 = 120/420
Likewise, for the 2nd fraction, since 12 × 35 = 420,
6/12 = 6 × 35/12 × 35 = 210/420
Subtract the two like fractions:
120/420 - 210/420 = 120 - 210/420 = -90/420
After reducing the fraction, the answer is -3/14

MathStep (Works offline)

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