Our hands-on center is sure to get kids buzzing about subtraction! Just place a problem card in the built-in stand…then use the bee manipulatives to solve. As kids move the hive to “take away” bees, they’ll master simple subtraction—in a fun, engaging way! Plus, each card is self-checking with answers on back. The center comes with 30 problem cards, 15 bee manipulatives, a beehive cover and a durable plastic activity tray. Tray measures 11 1/4" x 12 1/2".