Subtract 21/98 from 7/5, Solve 1 2/5

Subtract 21/98 from 7/5

1^st number: 1 2/5, 2^nd number: 21/98

7/5 - 21/98 is 83/70.

Find the least common denominator or LCM of the two denominators:
LCM of 5 and 98 is 490

Next, find the equivalent fraction of both fractional numbers with denominator 490
For the 1st fraction, since 5 × 98 = 490,
7/5 = 7 × 98/5 × 98 = 686/490
Likewise, for the 2nd fraction, since 98 × 5 = 490,
21/98 = 21 × 5/98 × 5 = 105/490
Subtract the two like fractions:
686/490 - 105/490 = 686 - 105/490 = 581/490
After reducing the fraction, the answer is 83/70
In mixed form: 113/70

MathStep (Works offline)

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