Question

$\frac{337}{31} - \frac{64}{81}$

Answer 1

337/31-64/81 =(337*81-31*64)/31*81=(27297-1984)/2511=25313/2511

Answer 2

$\displaystyle \frac{337}{31} - \frac{64}{81} = \frac{27297}{2511} - \frac{1984}{2511} = \frac{25313}{2511}$