Hello friends ! 
Today Im going to share with you one of my favorite card tricks (I didnt invent it).
We love it because it is always done and does not require preliminary preparation.
This enhances the effect of the trick.

You need a standard 52-card deck.

Step 1: Ask the spectator to pick 2 cards. Each card needs to be from 1(Ace) to 9 and they must not add up to 10.
Step 2: Sort out the remainder cards in piles as follows:
a) Everytime you see 10, Jack, Queen or King, place a card on it.
b) Everytime you see two cards that add to 10, place a card on each of the card.
c) Otherwise, start a new pile.
Step 3: Remove the piles that equal 10.
Step 4: There should be two piles left. Tell the spectators cards by subtracting from 10.

Link with video here.

Say if you liked it and dont forget to vote. :)
Thank you !