In this study, the aim was to combine the results obtained in independent studies aiming to determine the effectiveness of material use. The main question of the study is: "Does material use in classroom instruction improve students' academic achievements?" To answer this question, the meta-analysis method was employed. Meta-analysis is the method employed in order to statistically analyze the quantitative data collected in independent and multiple studies carried out on similar topics, and to reach a general judgment regarding the results of these studies. Certain criteria were used in order to decide which researches would be included in the meta-analysis. Based on these criteria, it was decided to include 57 experimental studies in the meta-analysis. As a result of this analysis; it was determined that the material use in classroom instruction has a positive effect in terms of academic achievement, and that this effectiveness level does not differ with respect to stages of education, course types and material types.