This I Have, Who Has? math game is designed for students to work on representing numbers with base ten blocks to 30. 30 cards are included. Simply print the cards on card stock and laminate for durability. There is a starting card and a final card so you know when the game is over! Hand out one card (or two, depending on the number of students) and students (sitting in a circle) call out their card when it is their turn. My second graders ask me to play this daily. It is a game that can be used all year long! Over and over....great time filler for supply teachers too! CCSS Aligned.