06 | 01 | 19 | 81 |
44 | 45 | 8 | 7 |
46 | 7 | 47 | 10 |
11 | 54 | 33 | 9 |
Inspired from Ramanujam's Magic Square
The process is simple - http://nrich.maths.org/1380
But the interesting part in the solution involves seeing a symmetry in 2d arrangement of numbers like if you fold the square, the external numbers add up to the internal numbers of the facing side. :-)