-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 left to right, 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.