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This material is contained in a wooden box divided into six compartments. The stamps are organized by hierarchical color: green, blue and red; and by the numerals printed on them: 1, 10, 100 and 1000. The material includes color-coded skittle and disks. This material is designed for the presentations and exercises with the four operations. The printed notes of this Montessori presentation from our CME Teacher Preparation Course are available for purchase from this webpage. Please search for: The Four Operation with the Stamp Game.