Subtract 7/70 from 20/9, Solve 2 2/9

Subtract 7/70 from 20/9

1^st number: 2 2/9, 2^nd number: 7/70

20/9 - 7/70 is 191/90.

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,
20/9 = 20 × 70/9 × 70 = 1400/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
7/70 = 7 × 9/70 × 9 = 63/630
Subtract the two like fractions:
1400/630 - 63/630 = 1400 - 63/630 = 1337/630
After reducing the fraction, the answer is 191/90
In mixed form: 211/90

MathStep (Works offline)

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