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Can you figure out how they do this? - MegaZone's Safety Valve
The Ramblings of a Damaged Mind
Can you figure out how they do this?
Check out http://www.mysticalball.com/

Can you figure out how they do it?

Run several 2 digit numbers through your head like they want, but pick numbers widely spaced. Notice anything about the results?

13 > 1+3 = 4, 13-4 = 9
38 > 3+8 = 11, 38 -11 = 27
75 > 7+5 = 12, 75 - 12 = 63

Notice it now? They're all multiples of nine.

Now look at the chart - all the multiples of nine have the same symbol. It is a mathematical trick. I thought it was kind of neat. ;-)

I picked this up from kensuke_aida

I am: amused amused
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