Step 1: Count Values
In this trick an Ace has a value of 1. A Jack has a value of 11. A Queen has a value of 12. A King has a value of 13.
Step 2: Shuffle and Begin
Turn over a card. Here you see a 5. Count off the next card as 6, then 7, and then 8. Do this until you reach 13.
In the photo you can see I have counted out eight cards to reach 13.
Step 3: Fold the Counted Cards Over Onto the First Card
Step 4: Turn All Cards Over to Make a Pile
Step 5: Make a Second Pile
Step 6: Make Six Piles
Step 7: Remove Any Three Piles
Step 8: Arrange the Three Remaining Piles in Any Order
Step 9: Turn Over Two Top Cards
Add the value of the cards turned over. In this case 9 plus 2 equals 11. Count eleven cards from the deck and set them aside. In the photo I grouped the eleven cards removed from the deck into groups of three and set them off with yellow boxes to make it easy for you to follow. The last grouping has, of course, only two cards to make eleven cards.
Step 10: Count Ten More Cards
Step 11: Count the Cards Still in the Deck
When you have your observer turn over the card on the remaining pile, it will have the same value as the number of cards left in the deck, that is a 5.
Step 12: It Worked!
This trick always works if there are 52 cards in the deck and if you count correctly while following the steps exactly. I do not know how or why. An engineer friend with a lot of higher mathematics training tried to understand it, but gave up. It is strange because it begins with the face value of a card and then switches to counting numbers of cards.
If the first card in several piles had a low value (Ace, 2, 3, etc.), you could run short on cards before counting out the six piles. In that case, fold some of the piles back into the deck and begin counting those piles again. Chances are you will draw some higher value cards and will have enough cards to make your six piles.
Also, six piles is a little bit for theatrics. The trick works perfectly well with only three piles.