Re: OT How do this work?


"Frank Reid" <reid_francis@xxxxxxxxxxx> wrote in message
news:1148853793.233413.41610@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
You're right. I looked at it for three minutes the first time. With
the change each time and the subset of viable numbers available (any
time you add the numbers of a two-digit number and then subtract that
sum from the original number, there are only 9 possible answers) after
"subtracting," you give the 9 possible answers the same symbol. It
will work every time.
Frank Reid


In math circles, its called "Casting out Nines". You get the same effect on
this site:

http://digicc.com/fido/

--riverman


.

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