Problem solving is a basic activity for human beings and becomes one of the goals in learning mathematics. The goal can not be fulfilled if the classroom learning does not pay attention to the problem solving ability. Guided discovery learning and cooperative learning STAD-type can be used to meet the goal through the learning process. The purpose of this study was to find out: First, the differences in mathematical problem solving ability of students who are given guided discovery learning and cooperative learning STAD-type, and the second is interactions between learning models (guided discovery learning and cooperative learning STAD-type) with students gender on mathematical problem solving ability. The population in this study was all eighth grade students of SMP Negeri 13 Medan academic year 2018/2019. The sample was taken randomly in two selected classes which were class VIII-1 as experimental class-1 and class VIII-2 as experimental class-2, each amounting to 32 students. The research instrument used was a test of problem solving ability. Data was analyzed with twoway Anova. The results of this study show that (1) There is difference in mathematical problem solving ability between students who are given with guided discovery learning and those who are given with cooperative learning STAD-type, (2) There is interaction between learning models (guided discovery learning and cooperative learning STAD-type) with students gender on students mathematical problem solving ability.

Mahasiswa dan dosen secara aktif bersama pemerintah membantu mengidentifikasi masalah masyarakat, dan turut andil dalam penyelesaiannya, khususnya dalam dunia pendidikan. Mahasiswa PKM mengamati langsung kegiatan pembelajaran dan menemukan pada saaat kegiatan pembelajaran, metode yang digunakan monoton. Kegiatan belajar berpusat kepada guru atau hanya satu arah dan siswa kurang fasih dalam penggunaan bahasa Indonesia. Maka, Tim PKM Simalungun menyulutkan solusi yang ditawarkan dengan diadakannya bimbingan belajar luring. Sehingga harapannya melalui bimbingan belajar luring ini, dapat membantu siswa dari ketertinggalan akibat pembelajaran daring. Pelaksanaan bimbingan belajar yang diberikan dengan menggunakan menggunakan Model Pembelajaran Kooperatif dengan metode belajar diskusi, tanya jawab, ceramah, dan eksperimen. Selama melakukan pengabdian, penulis melihat antusias Siswa SMP Swasta GKPS 6 Haranggaol untuk berpartisipasi mengikuti bimbingan belajar luring.