Effectiveness of the Utilization of Educational Games Based on PhET Simulation to Improve Students' Understanding of Mathematical Concepts on Fraction Material

The purpose of this study was to determine the effectiveness of the use of educational games based on PhET simulations in improving students' understanding of mathematical concepts at SMPN. Negeri 5 Padangsidimpuan. The method used in this research is Pre Experimental with One-Group Pretest-Posttest research design. The sample in this study were students of class VII-3 SMPN 5 Padangsidimpuan. Determination of students' understanding of mathematical concepts in this study using data instruments in the form of average pretest and posttest scores. The average student pretest score was 68.24% and the posttest had an average score of 84.62%. It can be concluded that the use of educational games based on Phet simulations can improve students' understanding of mathematical concepts in fraction material.