Subtract 7/18 from 98/70, Solve 1 28/70

Subtract 7/18 from 98/70

1^st number: 1 28/70, 2^nd number: 7/18

98/70 - 7/18 is 91/90.

Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 70 × 9 = 630,
98/70 = 98 × 9/70 × 9 = 882/630
Likewise, for the 2nd fraction, since 18 × 35 = 630,
7/18 = 7 × 35/18 × 35 = 245/630
Subtract the two like fractions:
882/630 - 245/630 = 882 - 245/630 = 637/630
After reducing the fraction, the answer is 91/90
In mixed form: 11/90

MathStep (Works offline)

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