Instructions:
Draw a 4 x 4 magic square.

Choose a number.
In the video, 47 was chosen
Fill in the squares.
Watch the magic of forty-seven appear.

How to make magic happen:
In the square below, the four numbers in the twenties are the only numbers which are altered.

N = the chosen number (example : 47)
N - 18 = 29
N - 19 = 28
N - 20 = 27
N - 21 = 26

All other numbers are always placed in the exact squares as indicated below

N-20	1	12	7
11	8	N-21	2
5	10	3	N-18
4	N-19	6	9

PS : Try this math card trick too!