Can you figure out how this works???

1) Go to the link below. After reading each window, click on Fido in the lower right corner of the picture.

2) In the last window type in your answer in the white box using the keyboard (there is NO cursor).

3) Watch the paper in Fido’s hand. You will be amazed.. I’m actually scraping my jaw off the pavement.

http://digicc.com/fido/

Will let you know once I figure out how it’s done!

### Like this:

Like Loading...

*Related*

HOW THE! WHAT THE!!! EH DAH! *Gasps in horror*

Bwahaha! I tried it again, and Mr. Dido got it wrong! I can rest easy now :p

Gosh.. this is complex.. i remember the trick in this, it is a very complex math. equation though

This is AMAZING!

thanks for sharing begad..

cool.

Ah, nice 🙂

The sum of all the digits of the number that is the difference between the original and the permuted numbers is always a multiple of 9. So as long as you circle a number that is not a 0, the circled number is always the difference between the sum of the digits of the number you type in, and the next highest multiple of 9. Note then that the reason they ask you not to circle a 0 is that the computer wouldn’t be able to distinguish if you’ve circled a 0 or a 9. cheers.

I mean, to follow up on that last note, if you actually do circle a 0, the computer will guess 9 … try it.

Awesome!

Let’s say you’re given 1234 and 3412. You subtract:

3412 – 1234 = 2178

So the possibles are 1, 2, 7, 8. Let’s say you picked “2”…. so 1, 7,

and 8. And it gets 2. Amazing, you think?

Watch me with some other numbers:

4321 – 1234 = 3087

4231 – 1234 = 2997

4123 – 1234 = 2889

4132 – 1234 = 2898

Okay, that’s enough of a sample. Let’s add now, a step it skips for you:

2 + 1 + 7 + 8 = 18

3 + 0 + 8 + 7 = 18

2 + 9 + 9 + 7 = 27

2 + 8 + 8 + 9 = 27

2 + 8 + 9 + 8 = 27

The real trick is, people think it knows your number. It doesn’t… it

just knows the digits HAVE to add up to a multiple of nine, because

you’re subtracting digits from themselves (even in a funky order.)

The only problem is if you circle a NINE or a ZERO, you can’t tell the

difference. That’s why you’re not allowed to circle zeros, which makes

it certain that you’re only circling 9’s in that case.