Primary mathematics teaching demonstrating device

A primary mathematics teaching demonstrating device pertains to a primary mathematics teaching aid and is realized as follows: brackets are arranged at two side edges of a supporting board, a horizontal shaft is arranged between the brackets, and three cylinders with numbers are arranged on the horizontal shaft; and three demonstrating windows are arranged from left to right on the supporting board between the brackets, the demonstrating windows from left to right are respectively provided with operational signs and an equal sign, adjustable supporting legs are provided below the supporting board, and fixing bolts are arranged on the supporting legs. The primary mathematics teaching demonstrating device is simple in structure, convenient in use and simple in manufacture; when the device is used, numbers are respectively written around the cylinders on the three cylinders, when number operation is needed, the cylinders can be rotated to make the numbers on the cylinders appear in the demonstrating windows, and thus the teaching effect is improved; and with the arrangement of the adjustable supporting legs, the height of the demonstrating device can be adjusted conveniently to facilitate watching of students sitting back.