Subtract 56/21 from 72/9, Solve 8 0/9

Subtract 56/21 from 72/9

1^st number: 8 0/9, 2^nd number: 2 14/21

72/9 - 56/21 is 16/3.

Find the least common denominator or LCM of the two denominators:
LCM of 9 and 21 is 63

Next, find the equivalent fraction of both fractional numbers with denominator 63
For the 1st fraction, since 9 × 7 = 63,
72/9 = 72 × 7/9 × 7 = 504/63
Likewise, for the 2nd fraction, since 21 × 3 = 63,
56/21 = 56 × 3/21 × 3 = 168/63
Subtract the two like fractions:
504/63 - 168/63 = 504 - 168/63 = 336/63
After reducing the fraction, the answer is 16/3
In mixed form: 51/3

MathStep (Works offline)

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