This report examines teachers' educational background and students' overall performance on the Third International Mathematics and Science Study-Repeat (TIMSS-R). Data analyses show that there are 17 Delaware classrooms performing above the average U.S. student score of 502. The majority of teachers in the top 10 higher performing classrooms had undergraduate degrees in mathematics. The overall trend indicates that the higher performing classrooms have teachers with a graduate degree. Teachers' years of experience are not correlated with higher or lower student performance. (KHR)