This material is used to represent in geometric form the hierarchy of number for: 1, 10, 100, 1000, 10,000, 100,000 and 1,000,000. The precise nature of these materials makes it possible to compare by size the decimal categories, visualize through the color-coded system the concept of decimal value and the families of number. A wooden tray for presentation of 1, 10, 100 and 1000 is included.