Subtract 70/20 from 7/98, Solve 7/98

Subtract 70/20 from 7/98

1^st number: 7/98, 2^nd number: 3 10/20

7/98 - 70/20 is -24/7.

Find the least common denominator or LCM of the two denominators:
LCM of 98 and 20 is 980

Next, find the equivalent fraction of both fractional numbers with denominator 980
For the 1st fraction, since 98 × 10 = 980,
7/98 = 7 × 10/98 × 10 = 70/980
Likewise, for the 2nd fraction, since 20 × 49 = 980,
70/20 = 70 × 49/20 × 49 = 3430/980
Subtract the two like fractions:
70/980 - 3430/980 = 70 - 3430/980 = -3360/980
After reducing the fraction, the answer is -24/7

MathStep (Works offline)

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