Upaya Meningkatkan Keaktifan dan Prestasi Belajar Matematika Siswa Kelas X 2 Jurusan Administrasi Perkantoran Smk Tamansiswa Banjarnegara Tahun Ajaran 2013/2014 melalui Model Pembelajaran Kooperatif Tipe Student Teams-achievement Divisions (Stad)

The purposes of this research is to increase the activeness and achievementstudent of office administration 10th grade of SMK Tamansiswa Banjarnegarara2013/2014 in mathematic with cooperative learning type Student Teams-Achievement Divisions (STAD). The research was Classroom Action Research(CAR). The subjects in this research were student of office administration 10thgrade of SMK Tamansiswa Banjarnegarara and It consists of 36 students. Theobject of this research were the student’s activeness and achievement of learningmathematic with cooperative learning type Student Teams-Achievement Divisions(STAD). The results showed that after the implementation of Student Teams-Achievement Divisions learning approach, the student’s active and achievementin learning mathematics has increased. This can be showed by the observation ofan increase in the percentage of students' learning activeness of 43.75% in thepre-cycle, increased to 59.38 % in the 1st cycle, and became 68.75% in the 2ndcycle. While the percentage of activeness based on the results of questionnaires ofactiveness, reaching 43.98% in the pre-cycle, increased to 56.25% in the 1st cycle,and becomes 61.86% in the 2nd cycle. Mathematics learning Achievement ofstudents is also higher than the initial value of 63.68 with the ability completenesspercentage of 5.56% (2 students) in the pre-cycle. the average value of the finaltest cycle increased to 75.37 with 55.56 % completeness (20 students), andbecame 84.15 with 75% completeness (27 students)