Subtract 3/84 from 5/20, Solve 5/20

Subtract 3/84 from 5/20

5/20 - 3/84 is 3/14.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 84 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420
Likewise, for the 2nd fraction, since 84 × 5 = 420,
3/84 = 3 × 5/84 × 5 = 15/420
Subtract the two like fractions:
105/420 - 15/420 = 105 - 15/420 = 90/420
After reducing the fraction, the answer is 3/14

MathStep (Works offline)

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