Subtract 7/21 from 14/90, Solve 14/90

Subtract 7/21 from 14/90

14/90 - 7/21 is -8/45.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 21 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
14/90 = 14 × 7/90 × 7 = 98/630
Likewise, for the 2nd fraction, since 21 × 30 = 630,
7/21 = 7 × 30/21 × 30 = 210/630
Subtract the two like fractions:
98/630 - 210/630 = 98 - 210/630 = -112/630
After reducing the fraction, the answer is -8/45

MathStep (Works offline)

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