Our most popular dice include the 10-sided dice, color coded to the Montessori Place Value System. A set of four (4) includes two greens, one blue, and one red 10-sided dice. The dice are numbered 0-9 thus allowing a child to roll any number between 0-9999. These dice are used in conjuction with materials such as number composition with the golden beads, the teen and tens board, the Bank Game, the Bead Frame, operations such as addition and multiplication as well as teacher made activities. Four options are available: jumbo opaque, small opaque, small pearlized, and small transparent.