Math teachers study

Experienced math teachers less common in low-income schools
Wealthier U.S. children are more likely to be taught by certified, experienced math teachers than those from poor families, according to a University of Missouri study, which examined eighth-graders in particular. When students are not taught by highly qualified teachers, their opportunity to learn is considerably lower.
Zhao, H., & Akiba, M. (In press). School expectations for parental involvement and its impact on student achievement in mathematics: A comparative study of middle schools in the U.S. and South Korea. Compare.