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In this study, a secondary analysis of the Early Childhood Longitudinal Study – K cohort (ECLS-K) was conducted to explore the effects of student engagement and instruction time on mathematics achievement in content domains in third graders. Using MIMIC modeling and independent t-tests, the present study shows that 1) student engagement was the most significant determinant affecting student mathematics achievement, especially in the content areas of multiplication/ division and place value; instruction time had no effect on student achievement; 2) boys and girls performed differently in different content domains; White/Asian were significantly more engaged in learning activities and outperformed significantly than the other races, but spent significantly less time on mathematics.