Try this, and then try and explain to me how it works....

http://www.magictricks.co.uk/mindreader/MagicTricksMR.html</p>

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I can't remember to be exact, but isn't it something to do with multiples of 9?

 

Duno, the first number I thought of was 63, and 6 + 3 = 9, but the next was 24 and it still worked!

 

its something like that

the clever thing is the symbol to number mapping changes each time so you think its knowing that you have a different symbol each time

 

this is freaky gets me every time