How do you solve a magic square using using integers -5 through +10?  Each column/row/diagonal has a sum of 10.
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1 Answer

-5 9 8 -2
6 0 1 3
2 4 5 -1
7 -3 -4 10

Has to be 4X4 because there are 16 numbers. Sum=10.

METHOD

Write numbers right to left, top to bottom, from -5 to 10 in 4X4 matrix, then erase numbers that do not lie on diagonals.

Starting with 9 and working backwards to -4, fill in all the remaining boxes with the remaining numbers left to right, top to bottom.

 

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