Analisis Kesalahan Siswa dalam Menggeneralisasi Pola Berdasarkan Taksonomi Generalisasi

: One of the skills in learning mathematics is generalization. The purpose of this study is to describe the errors made by students in generalizing number patterns. The generalization process in this study is based on the generalization taxonomy, namely relating, searching and extending actions and generalizing reflections in the form of written and oral statements from the subject. The process of determining the research subjects started from giving questions about number patterns to all students of class VIIIC MTsN 4 Denanyar Jombang as many as 35 students. There were 31 students who made mistakes in working on questions about patterns. There were 27 students who made an error in determining the number of squares in the nth model, these were the prospective subjects and 2 students were selected to be research subjects based on the strategies used in relating and searching. Four students experienced an error from the beginning in determining the number of squares in the specified model, this was not the subject of the study because the subject did not perform any of the generalization actions correctly. The results showed that the first subject made an error in the extending action, namely the subject could not expand the range of application. The second subject also experienced an error in the extending action, namely the subject did not understand the nth pattern so he could not expand the range of application. Both subjects made an overspecialization error, this happened because of the limited perception of students about the situation in the problem so that it could cause students to use inefficient strategies or generalization error