Magic square patterns
Jeannie Gorts · The Arithmetic Teacher · 1969
A magic square, as we all know, is one in which the sum of the numbers—horizontally, vertically, or diagonally—is the same number. Suppose you want to make a magic square of 9 sections, whose sum is 15. If you divide your sum by the square root of the number of sections your magic square consists of, your result is the center number of your magic square. In this case, 15 divided by 3 equals 5. (Note: When you have an even number of sections, you will have not one center number, but four.)