The Improvement of Teacher Competency Makes Expansion Learning Media through Model Workshops Modeling, Modification and Creativity

Teachers in Middle School Sub Rayon 23 Medan still has low competence in making learning media. The creative ideas from the science teacher have not yet emerged, the teacher's understanding of making the learning media expansion is still minimal, the teacher has not been motivated to make the media curiosity about the media is still low. This study aims to find out how to improve teacher competencies in making science learning media, especially expansion. The action hypothesis in this study is the teacher's competence in making science learning media possible improved through workshops. The subjects of the study were 9 people of Natural Sciences at Sub Rayon 23 Junior High School in Medan. The object of research is learning media especially expansion. Media Learning IPA is Swelling Solids of goods secondhand or materials that price it cheap so it can be affordable. The results of the data analysis makes learning media Expansion Solids in cycle 1 at 29.33 (Less), Cycle 2 at 64.00 (Good), and meeting 3 at 84.89 (Very good). Increase in the average value of teacher competence: 84.89%-29.33% = 55.56%. The results of the questionnaire analysis showed that 95.00% of the science teachers of the Sub- Rayon 23 Junior High School in Medan strongly agreed to make the learning media for Solid Substance Expansion through workshops conducted by researchers because of their increased competence.