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. Mathematical ability is the ability to solve student problems in giving answers. The ability to solve problems can build students' understanding. Hence, this study aims to analyse the improving students’ mathematical problem solving ability through guided discovery-excel learning.  Data were collected from one class (34 students) grade eleven of SMK NEGERI 1 GRATI Pasuruan. Data were collected by using test, observations, and questionnaires. Test is used to obtain the test results data of the student's mathematical problem solving ability after guided discovery-excel learning. In this research, excel is used to learn matrix material that can help and make students interested in learning matrix material. Teacher show excel in the main activities to explain the matrix material in the first and second meetings. Based on the results of research on improving the ability to solve mathematical problems, it was concluded that the results of the ability to solve mathematical problems in the matrix material of class XI APAT 2 SMKN 1 Grati through Guided Discovery Learning using Excel in the first and second meetings were still poor, it means the students were not able to understand in solving problems, planning solutions, implementing solutions, and re-examining solutions, while in the third meeting, students' ability to solve mathematical problems is good according to the specified success category, namely there were 23 students from the whole students (68%) in the good or excellent category at solving problems.

mathematics problem solving; guided discovery; excel