Subtract 7/12 from 35/21, Solve 1 14/21

Subtract 7/12 from 35/21

1^st number: 1 14/21, 2^nd number: 7/12

35/21 - 7/12 is 13/12.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84

Next, find the equivalent fraction of both fractional numbers with denominator 84
For the 1st fraction, since 21 × 4 = 84,
35/21 = 35 × 4/21 × 4 = 140/84
Likewise, for the 2nd fraction, since 12 × 7 = 84,
7/12 = 7 × 7/12 × 7 = 49/84
Subtract the two like fractions:
140/84 - 49/84 = 140 - 49/84 = 91/84
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