Subtract 10/70 from 18/9, Solve 2 0/9

Subtract 10/70 from 18/9

1^st number: 2 0/9, 2^nd number: 10/70

18/9 - 10/70 is 13/7.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 70 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 9 × 70 = 630,
18/9 = 18 × 70/9 × 70 = 1260/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
10/70 = 10 × 9/70 × 9 = 90/630
Subtract the two like fractions:
1260/630 - 90/630 = 1260 - 90/630 = 1170/630
After reducing the fraction, the answer is 13/7
In mixed form: 16/7

MathStep (Works offline)

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