Subtract 2/98 from 21/30, Solve 21/30

Subtract 2/98 from 21/30

21/30 - 2/98 is 333/490.

Find the least common denominator or LCM of the two denominators:
LCM of 30 and 98 is 1470

Next, find the equivalent fraction of both fractional numbers with denominator 1470
For the 1st fraction, since 30 × 49 = 1470,
21/30 = 21 × 49/30 × 49 = 1029/1470
Likewise, for the 2nd fraction, since 98 × 15 = 1470,
2/98 = 2 × 15/98 × 15 = 30/1470
Subtract the two like fractions:
1029/1470 - 30/1470 = 1029 - 30/1470 = 999/1470
After reducing the fraction, the answer is 333/490

MathStep (Works offline)

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