Subtract 56/21 from 1/20, Solve 1/20

Subtract 56/21 from 1/20

1^st number: 1/20, 2^nd number: 2 14/21

1/20 - 56/21 is -157/60.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 21 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
1/20 = 1 × 21/20 × 21 = 21/420
Likewise, for the 2nd fraction, since 21 × 20 = 420,
56/21 = 56 × 20/21 × 20 = 1120/420
Subtract the two like fractions:
21/420 - 1120/420 = 21 - 1120/420 = -1099/420
After reducing the fraction, the answer is -157/60

MathStep (Works offline)

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