“…In mathematics, researchers have assumed teaching knowledge is an integration of both subject matter knowledge and pedagogical content knowledge (Ball, 2017;Bruckmaier, Krauss, Blum, & Leiss, 2016;Carillo, Climent, Contreras, & Muñoz-Catalán, 2013;Rowland, 2013). As the theoretical framework for this study, Ball, Thames and Phelps (2008) Theory of Mathematical Knowledge for Teaching divided subject matter knowledge into common content knowledge (CCK), horizon content knowledge (HCK), and specialized content knowledge (SCK), whereas pedagogical content knowledge was divided into knowledge of content and students (KCS), knowledge of content and teaching (KCT), and knowledge of content and curriculum (KCC).…”