How you can make a magic Square?
To make a Magic Square with digits 1 to 9 when sum of each column, each row each diagonal is  15. 
 
 Divide 15 with 3. 
The result is 5.Place 5 in the centre. 
 
Then think of numbers in series  with 5 ,give you sum 15. 
 
8 + 5 + 2 = 15, (difference is 3)
 6 + 5 + 4 = 15 , (difference is 1) 
 
3 + 5 + 7 =15,(difference is 2)
 9 + 5 + 1 = 15,(difference is 4) 
  
  Place them vertically and horizentally. 
 
Add a constant number 3 to each of the number.
You will find another 
magic square with a sum 45 and the numbers are from 4 to 13.
You can make
 infinite number of magic square.

 
 
Construction of magic square keeps you mentally active.
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