Abstract
The main objective of this study is to identify components of teachers’ mathematical knowledge for teaching, associated with the knowledge of mathematical horizon (KMH) in order to describe this type of knowledge from the viewpoint of elementary school mathematics teachers. The research population of this study consisted of 118 elementary school mathematics teachers who responded to an open-ended questionnaire. Findings of this study illustrate that KMH can be considered as a separate category according to teachers’ voice. An analysis of teachers’ utterances resulted in three KMH characteristics: insight of subject matter, mathematical connections, and understanding of meta-mathematics.
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