For more than two decades, three components of teacher knowledge have been discussed, namely, content knowledge (CK), pedagogical content knowledge (PCK), and general pedagogical knowledge (GPK). Although there is a growing body of analytic clarification and empirical testing with regard to CK and PCK, especially with a focus on mathematics…

Aspiring middle school teachers in the United States take fewer math courses and are less knowledgeable in the subject than their counterparts in South Korea, Taiwan, and other countries. That gap in teacher preparation, coupled with curricular differences, could help explain achievement disparities between American students and their peers in…