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http://users.telenet.be/EYES-T/

Anyway, of course that is impossible, so feel free to explain what's going on (it's not that hard actually).

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Seen it before, can't remember how it works though

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Simple enough. Once you've made the subtraction, you will always end up with a number which is a multiplication of 9 (9, 18, 27, etc.) The reason for this is that whatever number you choose, if you had chosen the number 1 higher, you would also end up subtracting 1 more - hence, the number from 20 to 29 all land you on 18, 30-39 land you at 27, etc.

So in the table, they simply insert the same symbol on all of the possible end numbers. It randomizes which symbol is the 'magic' one, though, for that extra 'creepiness' factor.

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Yep. It's quite a nice trick imo, they had me going for a while until I figured out the pattern and that the symbol is changed each time you try again.

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(

clever but simple ...

2 digits a and b

ab - ( a + b ) = 10a + b - a - b = 10a - a + b - b = 9a ... all answers are to be divided by 9 ... and all numbers that are "9-dividable" have the same symbol

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all answers are to be divided by 9 ... and all numbers that are "9-dividable" have the same symbol

Except 99 and 90, which are only possible if a=10 or 11 (impossible)

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(

ah yes, I didn't even see that there was 90 and 99 ... well, whatever, people understood

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It doesn't work if you read it wrong. =P

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Haha!

My mom thought it was a part of the cult!

I had a hard time explaining this.

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lol.

It also worked for me.

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