Kids flip their way to math mastery! Each board has attached wooden tiles kids turn over to visualize and solve problems. Simply select a card, place it in the holder…then flip the tiles to add bananas, subtract acorns and more! The self-checking cards have answers on back. Each board comes with 25 activity cards. Complete set includes all 3 boards shown, for a total of 75 activity cards. Boards measure 9" x 11". Each board also available separately.