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Teacher collaboration is seen useful to improve teaching practices which is central to student learning. This study examines the impact of teacher collaboration on teachers’ conceptand procedure-based practices, and the influences of the two instructional practices on eighth-grade student mathematics knowing, applying, and reasoning achievement in the United States using TIMSS 2015 data. The results indicated that teachers’ frequent collaboration significantly and positively influenced their procedure-based teaching but negatively influenced concept-based teaching. In addition, no significant relationships could be identified between any of instructional approaches and student achievement in knowing, applying, and reasoning. However, student socioeconomic status and mathematics self-concept exerted significant and positive influences on student achievement.