Math Games

Question: Can some one tell me the math rule used on the following game?

Please do the game/puzzle in the following link and tell me what is the math rule used to get the result.... Thank you!

http://www.digicc.com/fido/

Answer: man its simple, if u take a number lets say abcd and then its inverse order which will be dcba.
now their difference = efgh (lets suppose)
so if u add up e+f+g+h what ever is the answer is divisible by 9
so if you omit one number => h in this case
the sum of these numbers will be e+f+g which will not be divided by 9. Add any number which makes it divisible by 9 and that number must be h.
e.g.
abcd = 9821
dcba = 1289
difference = efgh = 8532
(e+f+g+h = 8+5+3+2 = 18) (thats not part of the game, just to make your understanding clear that 18 is divisible by 9)
now suppose u omit 8
then 5+3+2 = 2+3+5 = 5+2+3 = 10 (jumbling it up doesnot matter as we have to take the sum of individual integers)

so 8 must be added to make it divisible by 9 i.e., 18 divisible by 9 so 8 is the omitted number.
Hope I cleared. If u still have any questions, feel free to contact me again.

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