Subtract 15/72 from 20/98, Solve 20/98

Subtract 15/72 from 20/98

20/98 - 15/72 is -5/1176.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 72 is 3528

Next, find the equivalent fraction of both fractional numbers with denominator 3528
For the 1st fraction, since 98 × 36 = 3528,
20/98 = 20 × 36/98 × 36 = 720/3528
Likewise, for the 2nd fraction, since 72 × 49 = 3528,
15/72 = 15 × 49/72 × 49 = 735/3528
Subtract the two like fractions:
720/3528 - 735/3528 = 720 - 735/3528 = -15/3528
After reducing the fraction, the answer is -5/1176

MathStep (Works offline)

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