Subtract 63/40 from 7/98, Solve 7/98

Subtract 63/40 from 7/98

1^st number: 7/98, 2^nd number: 1 23/40

7/98 - 63/40 is -421/280.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 40 is 1960

Next, find the equivalent fraction of both fractional numbers with denominator 1960
For the 1st fraction, since 98 × 20 = 1960,
7/98 = 7 × 20/98 × 20 = 140/1960
Likewise, for the 2nd fraction, since 40 × 49 = 1960,
63/40 = 63 × 49/40 × 49 = 3087/1960
Subtract the two like fractions:
140/1960 - 3087/1960 = 140 - 3087/1960 = -2947/1960
After reducing the fraction, the answer is -421/280

MathStep (Works offline)

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