This is a simple I Have Who Has game to help students practice recognizing their numbers from 1-20 out of order.
To play the game simply pass out the cards evenly among the students. They read the cards starting with 1 and work together to get through all the cards. When they have made it through all the numbers and got to 20 the game is over.
I would recommend printing on cardstock and laminating for a long lasting center.