Mr. PalmerŐs Algebra class
Just for fun
Use the numbers 1 to 9, each one exactly one time, in one of the squares below so that the sum of the digits in each row equals the sum of the digits in each column equals the sum of the digits in each diagonal.
You might want to use a pencil as you may need to erase a few times along the way. I sure did.
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Now try it with the numbers 1 to 16 in a four by four array.