Subtract 2/14 from 21/90, Solve 21/90

Subtract 2/14 from 21/90

21/90 - 2/14 is 19/210.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 14 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
21/90 = 21 × 7/90 × 7 = 147/630
Likewise, for the 2nd fraction, since 14 × 45 = 630,
2/14 = 2 × 45/14 × 45 = 90/630
Subtract the two like fractions:
147/630 - 90/630 = 147 - 90/630 = 57/630
After reducing the fraction, the answer is 19/210

MathStep (Works offline)

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