The abstraction process of junior high school students

The background of this study is in fact that students' abstraction process still low in geometry. Straight-line equations are a prerequisite in understanding geometry material further. Therefore, the objective of this study is to measure the process of student abstraction in straight line equations. The population in this study are Eight Graders from one of the junior high schools in Cimahi City, with the selection of research subjects, namely schools in the medium cluster category in Cimahi City. and the samples in this study are 3 students that categorized on high, medium and low abilities. This research is a descriptive qualitative study. The instrument of the research is a test that is analysed to see and measure the student's abstraction process which appears in straight line equations. The results of the analysis and observations show that the abstraction process from 3 students who categorized based on high, medium and low ability, shows different ability on abstraction process on the criteria of verbal reasoning, numerical ability, and abstract reasoning. Students with high ability category have high variable reasoning ability, high numerical ability and high abstract reasoning as well. While students with medium abilities have high variable reasoning abilities, moderate numerical abilities and medium abstract reasoning. For students with low ability categories have low variable reasoning ability, moderate numerical ability and low abstract reasoning. So this process of abstraction can be seen from students with high ability categories. As for students of medium and low ability, need more guidance so that their abstraction process can improve.