Subtract 98/90 from 5/7, Solve 5/7 - 1 8/90 as a fraction

Subtract 98/90 from 5/7

1^st number: 5/7, 2^nd number: 1 8/90

5/7 - 98/90 is -118/315.

Find the least common denominator or LCM of the two denominators:
LCM of 7 and 90 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 7 × 90 = 630,
5/7 = 5 × 90/7 × 90 = 450/630
Likewise, for the 2nd fraction, since 90 × 7 = 630,
98/90 = 98 × 7/90 × 7 = 686/630
Subtract the two like fractions:
450/630 - 686/630 = 450 - 686/630 = -236/630
After reducing the fraction, the answer is -118/315

MathStep (Works offline)

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