Math card trick ???

[Squisher]

My head hurts just watching this:

http://www.wimp.com/mathcard/

 

[lxskllr]

God makes it work

 

[slayer202]

its not very complicated if you really look at it. not that I'm going to take the time to study it

 

[JTsyo]

marked for a later look

 

[saratoga172]

I have no idea what just happened.

Fixed for you.

 

[lxskllr]

Fixed for you.

RoFL!

 

[JujuFish]

The way it's set up, the three cards go in the spot of a multiple of 16. That is, 16th, 32nd, and 48th spots in the deck. Those cards will be in that spot every time. Each time he goes through the deck, he's removing every other card, starting with the first one. Do that 4 times, and all you'll have left is every 2^4th card, or every 16th card.

Edit: The trick actually reverses the order of the cards every time he removes half. The principle remains the same, but the cards will be in the 6th, 22nd, and 38th spots in the deck instead.

 

[FDF12389]

The way it's set up, the three cards go in the spot of a multiple of 16. That is, 16th, 32nd, and 48th spots in the deck. Those cards will be in that spot every time. Each time he goes through the deck, he's removing every other card, starting with the first one. Do that 4 times, and all you'll have left is every 2^4th card, or every 16th card.

This

 

[slayer202]

are you sure about that...

ah forgot about the take 4 cards and put them at the bottom :/ ya, pretty simple lol

 

[blinblue]

Its actually very simple. The cutting the deck parts actually do nothing (just do it yourself and see, you reassemble the cut when you put all the cards back together).

So once you reassmble the deck, you have 4 (that you took from the pile of 9 and placed at the bottom) + 10, then Ace #1, then 15 cards (because no matter how they cut, you are just putting them back together), then Ace #2, then 15 cards, then Ace #3, then 5 cards (what remains after you put 4 of the 9 to the bottom).

so
14, Ace, 15, Ace, 15, Ace, 5

Lets label all the cards starting at the top of the deck, that card will be card #1
1,2,3,4,5, 6 ACE, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 ACE, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38 ACE, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52
This will always be the order of the cards (if you aren't convinced the cut does nothing, try it be placing the Aces face up go through and cut however you want, put the deck together and count the cards between the aces.


So as you do the "up down, up down" starting at number 1, all odd numbers will be face up
then all odd number cards will be face up. Notice that all the Aces are even numbered. So we through away all the "up" cards, that is, all the odd numbers.
We are left with
2,4,6 ACE, 8, 10, 12, 14, 16, 18, 20, 22 ACE, 24, 26, 28, 30, 32, 34, 36, 38 ACE, 40, 42, 44, 46, 48, 50, 52
Except we have reversed the order. That is number 52 is now the top of the pile, and number 2 is the bottom

Doing the "up down, up down" again. The ups will be 52, 48, 44, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4. The downs are then 50, 46, 42, 38 ACE, 34, 30, 26, 22 ACE, 18, 14, 10, 6 ACE, 2

Once again the order gets reversed and doing the "up down, up down" again, the ups will be
2, 10, 18, 26, 34, 42, 50. The downs are 6 ACE, 14, 22 ACE, 30, 38 ACE, 46.

Once again the order gets reversed and doing the "up down, up down" again the ups will be
46, 30, 14. The downs (the final three) are 38 ACE, 22 ACE, 6 ACE

And there you go, we have the three original cards.

 

[coldmeat]

We should just sticky a link to wimp.com since everybody posts every video from the site here.