Trick with numbers - Democratic Underground

mrboba1

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Wed Aug-04-04 10:33 AM
Original message

Trick with numbers

http://digicc.com/fido/

I got this at work, and I must resist the urge to figure it out...

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On the Road

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Wed Aug-04-04 10:41 AM
Response to Original message

1. The Reason It Works

is that if you subtract the two 3- or 4-digit numbers from each other, the sum of the digits will always be 9 or a multiple of 9. They add up the digits you typed in (eg, 214) and tell you you circled a 2, becaue that would make the total equal to 9.

As far as why the digits add up that way, it's one of those strange "9" things. I've never understood that.

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mrboba1

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Wed Aug-04-04 10:51 AM
Response to Reply #1

3. Ahh - yes, the magic of 9

I remember that from accounting class in college - if you had a mistake of transposing numbers, there was some thing about seeing if the difference was a multiple of 9.
Same concept.

Thx

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redqueen

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Wed Aug-04-04 10:44 AM
Response to Original message

2. I must've done it wrong

he didn't get it.

:shrug:

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