Effective mathematics learning is often the result of effective teaching with students learning mathematics through experiences that teachers provide for them (NTCM, 2000). Teachers need to have deep mathematics content knowledge in order to understand their students' thinking and so be able to select mathematics tasks which provide meaningful experiences to their students. There is overall agreement that teachers need to have well-formed content knowledge because this affects what they teach and how they teach it (Da Ponte & Chapman, 2016). It is, therefore, no surprise, that teachers' knowledge of mathematics continues to be an important theme in research on preservice mathematics teacher education (Da Ponte, & Chapman, 2016). It is reasonable to plan and conduct research which addresses elementary preservice teachers' (PTs') learning, with special attention given to their knowledge of fraction concepts and operations, issues related to this knowledge, and to how its development has been facilitated in mathematics education content courses. That is because preservice teachers are expected to teach important mathematical ideas at elementary level (McCormick, 2015; Behr, Wachsmuth, Post, & Lesh, 1984). In particular, studying PTs' knowledge for teaching fractions is important because it is widely recognized that the topic is difficult to learn and teach (Rosli, Gonzalez, & Capraro, 2011). Mathematical Understandings of Preservice Teachers Many research studies have shown that the mathematical understandings that preservice teachers gain from schooling and university mathematics courses do not adequately prepare them to teach primary school mathematics effectively (Ball, 1990a, 1990b; Even, 1993; Ma, 1999; Simon, 1993), particularly given the kind of teaching demanded by recent reforms of the