Negative MagicIn a magic square the numbers in each row, column and both diagonals add up to the same total. Type the missing numbers into the empty cells. 
Here are four magic squares. Work out the magic line total for each square then fill in the missing numbers.
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In a magic square the numbers in each row, column and both diagonals add up to the same total. The first task is to find what that magic total is for each square.
For example, in the following square there is one line of three cells that are already filled in. The magic total can be found by adding those three numbers togather.
Magic total = 4 + 1 + 2 = 3
Now look for a line of three cells of which two are already filled in. In this example the top row. The missing number when added to 4 and 3 will give the magic total of 3. It can be found by subtracting the two given numbers from 3
3 (4 + 3) = 3 + 4  3 = 2
Repeat this process by finding lines of three cells of which two are already filled in.
3  (2 + 2) = 3
Again
And again
And again
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