Kids count gumballs to build essential math skills with our hands-on light-up center! The center includes 10 translucent activity sheets, 20 see-through counters, 20 number tiles and 3 symbol tiles, plus a light-up board that stores all the pieces. Children simply switch on the light and use the manipulatives to complete engaging activities right on the board. Plastic board measures 9 1⁄2" x 10 3⁄8". Board requires 3 “AA” batteries (not included).