The New Sudoku Players' Forum

by **jwc471** » Sat Dec 31, 2005 11:22 pm

Way back in my Jr. High days, I had a math problem that you had a 9 square grid and you had to have the numbers add up to the same total going up, down and diagonal. There was a formula but I forgot it(senior moment). Can you help me? Thank you

by **Chessmaster** » Wed Feb 01, 2006 2:54 am

not sure but supose you want to add the numbers 1-100 up you take

101*50 you get 5050.

the forumula is N as a real number .5N(N+1)

by **udosuk** » Wed Feb 01, 2006 1:05 pm

I think jwc471 is looking to construct a 9x9 diagonal magic square...
However don't know any mathematical formula regarding it...
Probably there are some mechanical methods...

by **Chessmaster** » Wed Feb 01, 2006 10:19 pm

thought so can't think of any now but i will look into it

by **Jean-Christophe** » Thu Feb 02, 2006 2:56 pm

Seems you're looking for Magic squares.
There are mehods to generate them.

It's well explained on Wikipedia : http://en.wikipedia.org/wiki/Magic_square

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Addition puzzle

9 square grid

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