$$16\times \left(\frac{76+1}{2}\right)$$
Add $76$ and $1$ to get $77$.$$16\times \left(\frac{77}{2}\right)$$
Express $16\times \left(\frac{77}{2}\right)$ as a single fraction.$$\frac{16\times 77}{2}$$
Multiply $16$ and $77$ to get $1232$.$$\frac{1232}{2}$$
Divide $1232$ by $2$ to get $616$.$$616$$