Playful thinking
Play proceeds to the left around the table. On your turn, you may flip two cards face up. If one of the cards is a 10, you may take it at once and flip another card face up. If the pair of face-up cards add together to make 10, you get to take the pair. If they do not make 10, leave them for a few seconds so all players can see what they are, then turn them face down and let the next player take a turn.
Full rules for Tens Concentration is at Let’s Play Math: “Math is a game, playing with ideas. This blog is about learning, teaching, and just playing around with K-12 mathematics. Have fun!”