Missing Numbers - 10

The number in the circle is obtained by multiplying all the number surrounding it.

$\begin{aligned} 5 \times 4 \times 3 \times 2 & = 120 \\ 6 \times 4 \times 3 \times 2 & = 144 \\ 5 \times 4 \times 6 \times 7 & = \boxed{840} \\ \end{aligned}$