Development of Two-Dimentional Geometry Module based on APOS Theory for 4th Grader Students

This study aims to produce two-dimentional geometri module based on the APOS theory for 4 th grader students is valid and feasible. research method development (R&D) using a 4D model (define, design, develop, disseminate). However, in this study, 3-D was modified, namely disseminate stage not carried out due limited time, energy, cost carrying research. The subject of Semarang State Islamic Elementary School (MIN Semarang). Based results it found that (1) assessment by material media expert quality validators very good category with value 4,7 4,4. (2) Student learning outcomes from field trials obtained an average 79,8 completeness level 78.6%. It can be concluded product feasible use