Teaching materials issued by the government lays out a minimum of effort to do teachers and students to Achieve competency expected. However, The Necessary adjustments to student characteristics and are effective in learning. An alternative solution is by developing teaching materials Sciences natural supplement that can help students to learn science with a scientific approach as mandated by the Curriculum 2013, the roomates which is also effective in learning. The purpose of this study was to Determine the effectiveness of the supplement teaching materials with a scientific approach to the fourth grade of elementary school students. The research method to Determine the effectiveness of the supplement teaching materials using normality test, homogenitas test and t-test (Post-test or Achievement) Data on the effectiveness of teaching materials Obtained from the analysis of attainment and student achievement scores. The analysis Showed that the Obtained Data normality test sig = 0,121. This value is greater than 0,05, the which means that Null hypothesis is accepted or the distribution of normal data. In homogonitas test uses a Levene Test technique that the significant value in engineering Levene Test amount 0,619. The above calculation using a significance level of 5% and a significance value of the Data Showed that p> 0,05. This indicates that the data derived from the Populations with equal variances or both homogeneous group. Based on the analysis, the experimental class has an average value of learning achievement higher at 87,3 Compared with the control class has an average value of 81,17 can be concluded that supplement instructional materials science with a scientific approach effectively to improve student achievement in SDN Brodot I Academic Year 2014/2015.   Keywords: supplement  teaching materials,  scientific, sciences