See if you can figure this out.

[squarebear]

I made a magic trick and wondered if anyone can figure out how I did it.
http://www.square-bear.co.uk/temp/magic.swf

No prizes for working it out apart from the kudos of being smart!

[Caran]

too complicated for me

[dabees]

Just a freak of the number 7, not sure of the mathematical equation. But divide a card of 21 at least 3 times and you'll always find the eleventh card will be the one you chose.

[Lore]

<<< is checking her bedroom for cameras... well done Sq.B :)

[mrs.chappie]

It worked for me, SB. Very clever!

[mrs.chappie]

Oh sorry, didn't read your question fully. I can't figure out how you did it. Don't suppose you'll tell us? (I probably wouldn't understand, anyhoo).

[tamborine]

fabulous - it guessed my number....well done, can I put it on my FB site for the G'kids ?

[squarebear]

Of course you can put it on your site. If you like I can personalise it for them, so it says something like "Grandma's magic predictor for Sally and Ben", if you post me some details.