<![CDATA[Abstract: This research aims to improve learning process and increase student’s mathematical achievement through implementation of Discovery Learning model. This type of research is Classroom Action Research with two cycle. The research was conducted in class XI science 2 SMA Negeri 1 Tempuling in the first semester of the 2018/2019 academic year. The subject of this research consist of 27 students, there are 13 female students and 14 male students. The research instrument consists of learning materials and instruments for collecting data. Learning materials used in this research are the Syllabus, Lesson Plan and student worksheets. Instrument data collectors used in this research are observation sheet and mathematical achievement test. Data analysis techniques in this study are descriptive narrative analysis of qualitative data and descriptive statistics analysis ofquantitative data. The percentage of students which ispass Minimum Mastery Crieria (MMC) increase from 44,4% to 55,6% at the first test and to 77,8% at the second test. This research concludes that the implementation of Discovery Learning model improved the learning process and the student’s mathematical achievement at class class XI science 2 SMA Negeri 1 Tempuling in the first semester of the 2018/2019 academic year.Key Words : Mathematics Learning Achievement, Discovery Learning Model, Classroom Action Research]]>
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