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Practical arithmetic with long ways. Solving open practical problems. (Sachrechnen mit weiten Wegen. Offene Sachaufgaben lösen.) (German)
Grundschulzeitschrift 29, No. 283/284, 50-53 (2015).
Classification: F92 D52 M12
1
Different approaches towards the concept of symmetry. (Auf unterschiedlichen Wegen zum Symmetrieverständnis.) (German)
Math. Differ. 4, No. 3, 16-21 (2013).
Classification: G22 G52 U62
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