set of sectors of a circle to demonstrate the division of a whole into parts. The composition includes sectors marked according to fractional parts: 1/2 (2 sectors), 1/3 (3 sectors), 1/4 (4 sectors), 1/5 (5 sectors), 1/6, 1/12 (24 sectors in total). Each sector has triple marking: ordinary fraction, decimal fraction and percentage value, which helps students develop an understanding of the relationship between different forms of recording parts of a whole. The elements of the model are equipped with fasteners for convenient use. The diameter of the model is not less than 300 mm. It is allowed to perform on a magnetic base for convenient use on a board.
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