Click the stage. If it were hard to read, here are the instructions here: Before you begin the trick and out of sight of your spectators, count out 25 cards. When you come to present your trick, place these 25 cards on top of the pile and hold the cards slightly apart so you know where they end. Split the pack of cards into two piles at the point where the split is. Place the 25 cards face down on the table and ask a spectator to choose one card from the remaining cards in your hand. Get them to show it to the rest of the audience and to memorise it. Ask them to place it back on top of the pack you are holding and add back your 25 cards from the table. Start dealing the cards face up and silently count to 26. Ta Dah! This will be the spectator’s card. (You can also make up your own way, I do this trick a bit differently though.)
Thank you to the source Easy Card Tricks For Kids for this trick! I showed this to my class, and they thought it was really impressive!!! But don't tell anyone how to do this, a magician never shares their secrets