to convert a fraction to a decimal, like say a/b is really simply the quotient of a ÷ b.
now, let's first convert the mixed fraction to improper, and then do the division.
[tex] \bf \stackrel{mixed}{5\frac{5}{16}}\implies \cfrac{5\cdot 16+5}{16}\implies \stackrel{improper}{\cfrac{85}{16}}\\\\[-0.35em]
\rule{31em}{0.25pt}\\\\
\cfrac{85}{16}\implies 85\div 16\implies 5.3125 [/tex]
