Analisis Kesalahan Siswa Berdasarkan Prosedur Newman Pada Soal Kemampuan Berpikir Kritis Materi Sistem Persamaan Linear Tiga Variabel Kelas X

The purpose of this research is to find out the types of mistake that student made when solving the test of critical thinking skill about Three Variables Linear Equations System in Class X according to Newman’s Error Procedure, as well as the factor that cause student make these mistake. This research is used a method of descriptive qualitative. The participant of this research are 20 students grade X-MIPA 1 of 16 Senior High School Jakarta. According to the data analysis using test and interview, we can conclude that there are 4 of 5 Newman’s Error that the student did. Those are comprehension error, transformation error, process skills error, and encoding error. All those mistake caused by some factor, he factor are the lack of students understanding of the material and questions, because the students are not used to solved the story questions that require critical thinking, and lack of carefulness in reading in question