Although mathematics standards have changed dramatically in recent years, teaching mathematics is as complex as it has always been. Some would argue that mathematics teaching has become even more complex, with the implementation of the Common Core State Standards for Mathematics (CCSS-M) (NGA Center & CCSSO, 2010), as teachers are being asked…

In this study, we examined the types and the frequencies of questions and explanations exchanged between four teachers and their students in fourth-grade mathematics classes, across two years. Specifically, we observed these classes for one week in two separate, consecutive years; in the first year, they all employed a traditional curriculum,…