Susilawati2013-01-222013-01-222013-01-22Sahlanhttp://repository.unri.ac.id:80/handle/123456789/1575PENERAPAN MODEL PEMBELAJARAN KOOPERATIF PENDEKATAN STRUKTURAL NUMBERED HEADS TOGETHER (NHT) UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKAPENERAPAN MODEL PEMBELAJARAN KOOPERATIF PENDEKATAN STRUKTURAL NUMBERED HEADS TOGETHER (NHT) UNTUK MENINGKATKAN HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS X2 SMAN 2 TAMBANG Susilawati1 Sakur2 Syarifah Nur Siregar2 Susilawati.matematika08@gmail.com ABSTRACT This research aimed at improving achievement in teaching and learning process at class X2 of SMAN 2 Tambang on peculiar semester 2012/2013 by implementing cooperative learning model of numbered heads together in mathematics lesson. This research is classroom action research. It was conducted in two cycles. The activity and achievement data were gained by collecting activity data by using observation sheet and daily test. The data which collected were score which descriptive analyzed statistic. The achievement in the first cycle found that the percentage of students who achieve KKM is 71,88% and the second cycle is 81,25% an increase from before the measures the percentage is only 12,5%. The conclusing of the study showed that the implementing of cooperative learning model for numbered heads together structural could improving achievement mathematic.otherNumbered Heads TogetherCooperative learningAchievementstudent Paper Post Degree