Once again... If its been posted Ill get off my cheap ass and contribute. http://www.milaadesign.com/wizardy.html
Really? Cuz it's been posted... Gimme a minute... OH and the digits of the numbers with the same symbol when added together all = 9. EDIT: Got it... http://bbs.clutchfans.net/showthread.php?t=52868&highlight=number+digits+symbol
Hint: look at the signs of all the numbers which are multiples of '9'...they all happen to be the same...
It is very similar to the trick that you can use to figure up 2 digit multiples of 11. What's 11 * 22= Easy 242. 11 * 17 = 187 11 * 35 = 385 See the pattern? The middle number is the sum of the 2 digits of the original number. How is this useful? I have no idea!