<p><strong>Abstract:</strong> This study aims to describe the students' commognitive in solving linear problems of one variable. This study uses a qualitative approach to the type of descriptive research. The stages in this study consisted of preparation, data collection, and data analysis. The results of this study are that there are two strategies students use in solving problems when analyzed using commognitive components. Two strategies used by students are the strategy of finding patterns and trial and error strategies. Students with strategies finding patterns in using commognitive components in solving problems look systematic compared to students with trial and error strategies.</p><strong>Abstrak:</strong> Penelitian ini bertujuan untuk mendeskripsikan <em>commognitive </em>siswa dalam menyelesaikan masalah persamaan linier satu variabel. Penelitian ini menggunakan pendekatan kualitatif dengan jenis penelitian deskriptif. Tahapan dalam penelitian ini terdiri dari persiapan, pengumpulan data, dan analisis data. Hasil dari penelitian ini adalah terdapat dua strategi yang digunakan siswa dalam menyelesaikan masalah apabila dianalisis menggunakan komponen <em>commognitive</em>. Dua strategi yang digunakan siswa yaitu strategi menemukan pola dan stretegi coba-coba. Siswa dengan strategi menemukan pola dalam menggunakan komponen <em>commognitive </em>dalam menyelesaikan masalah terlihat sistematis dibandingkan siswa dengan strategi coba-coba.

21st century mathematics learning is learning that refers to the four learning characters formulated in 4C, namely communication, collaboration, critical thinking and problem solving, creativity and innovation. One important aspect that needs to be improved is mathematical communication skills. This can be seen from the results of initial observations that the mathematical communication skills of students are still relatively low. This type of research is classroom action research with the aim to improve students' mathematical communication skills through the cooperative learning model gallery walk type. The research subjects were 32 students of semester V offering 2017 2017 State University of Malang 2019/2020 academic year. The material used is the limit function and derived functions. The results showed that the mathematical ability test scores in cycle I and cycle II were 69.6 and 78.1. The percentage of students who completed the first cycle and the second cycle was 67.5% and 80%. Based on the results of Cycle I and Cycle II, it can be seen that studying with a gallery walk type cooperative learning model can improve the mathematical communication skills of semester V students offering E 2017 2017 State University of Malang 2019/2020 academic year.