Center has everything you need for graphing or for a hundreds board. Includes two 16" x 16" magnetic wipe-off boards that fold to 8" x 8" (one with blue 1-100 grid, the other with white 10x10 graphing grid. 225 magnet square tiles work with either board; includes printed 1-100 tiles and 25 each of red, yellow, blue, green, and white squares for make your own pieces.