Luke Jermay - Magic Square

Luke Jermay - Magic Square

Performers ask the audience casually say a two-digit performer that can quickly write 16 numbers in the grid in a 4 4 each row or each column or diagonal suppression or corners or " Tian " four small Gerry summed digital fonts are the audience said that number .

The performer has a number named at random. He / she then quickly writes out 16 numbers within a grid. Upon examination all combinations within the grid are seen to have totaled the named number.
Check out the demo video. This is a great trick to know for a wide variety of situations.