You can get the magic total by squaring the number, adding 1, multiplying by the number, then dividing by 2.
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Think! What if the magic square had an even number of cells. There's your answer.
The number is 7.
harry of course
It is the square of the original number. If the original number represents a length, then the square of the original number represents an area of a square with side equal to the original number.
Start with a magic square which includes the number 3. Then either: Add 3 to each number, or Multiply each number by any integer other than 3.