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Abstract. In this article we study error patterns related with the addition of natural numbers, and also methods of overcoming the identified mistakes. For the research 74 primary school teachers were asked to write down, which kind of error patterns related with addition they have identified in their classroom, and how they tried to overcome these misconceptions and inaccurate procedures. Methods of representing addition and mental arithmetic strategies are presented, too.

Keywords: Mathematics teaching, primary school, numeracy, teaching addition, representations of addition

Zusammenfassung. In diesem Artikel werden wir die Fehler-Muster im Zusammenhang mit dem Zusatz von natürlichen Zahlen, und auch die Methoden zur Überwindung der festgestellten Fehler. Für die Forschung 74 Primarschullehrer wurden gebeten, schreiben Sie, welche Art von Fehler im Zusammenhang mit Muster Zusätzlich haben sie in ihrer Klasse, und wie sie versucht, um diese Missverständnisse und falsche Verfahren. Methoden, die von Addition und Kopfrechnen Strategien vorgestellt werden, zu.