Originally posted by minnie_me
I'll need some help figuring this out.
You think of a two digit number: call it XY, where both X and Y are member of {1, 2, 3, ..., 9}.
This number is equal to 10X + Y. You then subtract each of the two digits, and get:
(10X + Y) - X - Y = 9X
Therefore, the answer you get will be a multiple of 9. When you look at the table, you see that all the multiples of 9 have the same symbol - the rest is just noise. Click the square, and the symbol for the multiples of 9 comes up.
There are some great ways relatively simple math can be used to do tricks. There is a game with these rules:
1) Write down (or make counters for) the numbers from 1-9
2) Take turns choosing one of these numbers (each number can only be chosen once).
3) First player to get three numbers adding up to 15 wins.
With a little bit of practice, you will never, ever lose this game...you simply memorize a
magic square and then just think of it as tic-tac-toe. Note: The simplest Magic Square is:
8 1 6
3 5 7
4 9 2
The digits from 1-9 are each used once and it adds up to 15 horizontally, vertically and diagonally.
Off topic, of course, but I think it's cool! Now, if only I can find an SP willing to play numerical Twister with me...
