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As big as\dots. Building up ideas of size on units of square measure. (So groß wie\dots. Aufbau von Größenvorstellungen zu Flächenmaßen.) (German)
Mathematik 5 bis 10 35, 8-9 (2016).
Classification: G33 D83
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Sponge-rubber triangles. Discoveries at triangles through placing and testing. (Moosgummidreiecke. Entdeckungen an Dreiecken durch Legen und Ausprobieren.) (German)
Mathematik 5 bis 10, No. 27, 22-25 (2014).
Classification: G43 D83 U63 G83
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