Contextual Teaching Learning Model is a learning model that can provide opportunities for students to express their own ideas and are real. This research consists of two cycles where for each cycle starts from planning, action, observation and reflection. The purpose of this study is to describe the improvement of student learning outcomes in Mathematics through the application of the Contextual Teaching Learning Model and to describe the implementating of the learning process in Mathematics through the implementing of the Contextual Teaching Learning learning model. This research was conducted in August to September 2019 in class V / A SDN 075024 Duria Balaki with 15 students, 7 boys and 8 girls. The results of the study are student learning outcomes in Mathematics through the application of the Contextual Teaching Learning Model of learning increase, where at the end of the cycle the average student learning outcomes are 82 with a percentage of 80% completeness and the average reflection result at the end of the cycle reaches 82% classified as good category , so that the learning process in Mathematics subjects is improved through the application of the Contextual Teaching Learning Model. Thus it can be concluded that student learning outcomes in Mathematics lessons increase through the application of the Contextual Teaching Learning learning model and the learning process in Mathematics subjects is improved through the application of the Contextual Teaching Learning Model.