Subtract 7/5 from 14/21, Solve 14/21

Subtract 7/5 from 14/21

1^st number: 14/21, 2^nd number: 1 2/5

14/21 - 7/5 is -11/15.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
14/21 = 14 × 5/21 × 5 = 70/105
Likewise, for the 2nd fraction, since 5 × 21 = 105,
7/5 = 7 × 21/5 × 21 = 147/105
Subtract the two like fractions:
70/105 - 147/105 = 70 - 147/105 = -77/105
After reducing the fraction, the answer is -11/15

MathStep (Works offline)

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