Question 879680
Are you looking to multiply? 
Change the mixed numbers to fractions then multiply numerators and denominators.
{{{81+1/3=243/3+1/3=244/3}}}
{{{81+5/12=972/12+5/12=977/12}}}
So then,
{{{(244/3)(977/12)=238388/36}}}
{{{(244/3)(977/12)=59597/4}}}
{{{(244/3)(977/12)=14899+1/4}}}