7 5/6 x 11 2/4

To multiply fractions you will need a COMMON denominator:

7 5/6 = 7 10/12  =   94/12

and

11 2/4 = 11 6/12   =  138/12    Now you can multiply them

(138 x 94)  /  (12x 12)    12972/144 = 1081/12  =90 1/12

You don't need a common denominator though......

\(7\dfrac{5}{6}\times 11\dfrac{2}{4}\\ =7\dfrac{5}{6}\times 11\dfrac{1}{2}\\ =\dfrac{47}{6}\times \dfrac{23}{2}\\ =\dfrac{47\times 23}{6\times 2}\\ =\dfrac{1081}{12}\\ =90\dfrac{1}{12}\)