Manage the mathematical symbol to solve this puzzle:

$16 * 8 * 2 * 3 * 4 = 8$

By using your numerical and logical reasoning skills please try to figure out which number is missing in the questions below. The numbers around will give you the clues you need to solve the puzzle.

$6, 12, 48, 264, 1560, ?$

What number should come in place of the question mark?

$\begin{array}{|rrrr|}\hline 2& 3& 1& 2\\ 3& 4& 4& 5\\ 5& 6& 6& 7\\ 30& 43& 51& ?\\ \hline\end{array}$

What number should come in place of the question mark?

What number should come in place of the question mark?

Each circled number is the sum of the adjacent row, column or diagonal of the numbers in the square display.

What is value of x in the above diagram?

Which number should replace the question mark?