Subtract 14/21 from 35/20, Solve 1 15/20

Subtract 14/21 from 35/20

1^st number: 1 15/20, 2^nd number: 14/21

35/20 - 14/21 is 13/12.

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,
35/20 = 35 × 21/20 × 21 = 735/420
Likewise, for the 2nd fraction, since 21 × 20 = 420,
14/21 = 14 × 20/21 × 20 = 280/420
Subtract the two like fractions:
735/420 - 280/420 = 735 - 280/420 = 455/420
After reducing the fraction, the answer is 13/12
In mixed form: 11/12

MathStep (Works offline)

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