• 428.856 Teilnehmerinnen und Teilnehmer insgesamt • Gretel-Bergmann-Grundschule erhält Preis für besonderes Engagement • Aufgaben stammen aus 18 Ländern Welchen Weg muss die auf dem Bild dargestellte Schildkröte gehen, um ihren kompletten Garten abzugrasen, wenn sie jedes Feld nur einmal betreten darf? Welche Wassersperren muss der Müller schließen, damit er in Ruhe Räder in seine…
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