How is this trick done, I can't figure it out?

Question

10 points for first to work it out. Click on link below, its really good.

http://www.digicc.com/fido/

Answer 1

dude!

thats hella fricky.

ahh!

awsome!

Answer 2

Haha. Just did it. I have no idea how it's done.

Answer 3

Okay. I got it

When you pick the number 4197

rearange it to                     1794

it subtracts to                    2403

you circle a number other than 0

any number. Lets choose 3.  Then when you type in 240

                                               9-(2+4)=3

It just adds all the digits in yours together , subtracts from 9 then it has your answr

Answer 4

it didn't get my number??

Answer 5

it's f*ck my a.s.s!!!

Answer 6

that is so freaky!

Answer 7

Dont really know how.

But if I start out with 1111

Why it tell me I choose 9?

Answer 8

In mathematics you can undo what you do in a number of various ways.  say you multiply a number by 2 and then take that same number and multiply it by 3.  So then you can get you original number back by dividing by 6.  The things they have you do is putting it together and taking it apart in a special way.  no trick.  

Answer 9

I tried it and it didn't.

Answer 10

its just mathematics

Answer 11

the calculations are put forth then reversed using different methods... EG.... times by 10 is the reverse of divide by 5 then half that number... then somewhere along that line they put in a question about your given number... that evens the number out to what they want.. and they then give you the number which they intended in the first place...  

Answer 12

WOW - I did it twice and it chose both my numbers.

I have no clue whatsoever!!!!  

I even put my paper under my computer so it couldn't see my digits!!!  

Answer 13

THEY DIDNT EVEN GET MY NUMBER RIGHT!

Answer 14

OK when you add up the digits you didn't circle, and subtract it from the nearest multiple of nine, you will get the answer that you circled.

EX 531 (circled 5)

     3+1=4

     9-4=5

Answer 15

c**p got it wrong 4 out of 5 times

Answer 16

This has been around for a long time, still a good trick, (haven't a clue how it works, it just does!)

Answer 17

He got mine wrong but when u enter a two didgit number he minuses the smaller from the larger

Answer 18

Yes I now how it´s done but like all tricks if I told you you would tell someone else etc and it would no longer be a secret trick.

Answer 19

i really dont know but it is fun

Answer 20

omg that things good

Answer 21

theres quite a lot of things like this on the internet but the trick of it is it will always make a certain number or certain digits and as you cant circle 0s it will elimate other possablities

Answer 22

idk

Answer 23

There is a system where when there are a certain group of numbers together, the answer must be the one programmed in the system. for example, if there are the numbers 3 and 0, the answer is programmed to be 6

Answer 24

Transposition errors make differences that are divisible by nine, eg 651-561 = 90.  By jumbling the number, you make the difference of the jumbled number and the original number a multiple of 9.

The sum of the digits of a multiple of 9 is also a multiple of nine, eg 6903 => 6+9+0+3 = 18, another multiple of 9.

In the 6903 example, if you had circled the 0 or 9 you would probably have asked another question.  If you had circled 6, the sum of the remaining digits (903) is 12.  18 (the next highest multiple of 9) - 12 = 6.  Similarly if you had circled 3, the sum of the remaining digits is 15, and 18-15 = 3

Gimme my 10 points.

Answer 25

He was wrong, i picked 9 he picked 8. not a very good mind reader. I didnt do it wrong

Answer 26

the calculations are put forth then reversed using different methods... EG.... times by 10 is the reverse of divide by 5 then half that number... then somewhere along that line they put in a question about your given number... that evens the number out to what they want.. and they then give you the number which they intended in the first place...

Answer 27

i have no idea

Answer 28

Cool it worked :) yeh something about reversing and narrowing the number down...???