Subtract 80/98 from 30/21, Solve 1 9/21

Subtract 80/98 from 30/21

1^st number: 1 9/21, 2^nd number: 80/98

30/21 - 80/98 is 30/49.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 98 is 294

Next, find the equivalent fraction of both fractional numbers with denominator 294
For the 1st fraction, since 21 × 14 = 294,
30/21 = 30 × 14/21 × 14 = 420/294
Likewise, for the 2nd fraction, since 98 × 3 = 294,
80/98 = 80 × 3/98 × 3 = 240/294
Subtract the two like fractions:
420/294 - 240/294 = 420 - 240/294 = 180/294
After reducing the fraction, the answer is 30/49

MathStep (Works offline)

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