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the purpose of this research was to describe type of cooperative learning process NHT can increase the activity and learning achievement students of class VII B SMP Muhamadiyah 9 Yogyakarta of second semester in academic year 2013 / 2014. This research is classroom action research. The subjects in this research were students of class VII B SMP Muhamiday 9 Yogyakarta. Object in this research is a mathematical activity and learning achievement using cooperative learning model NHT. Data collection technique in this research was done by using observation, documentation techniques, and tests. The result of this research showed that after application of mathematic learning through NHT. Activity and learning mathematic achievement of students has increased. This is evidenced by an increase in the percentage of prasiklus average percentage of 28,7% of student activity. In the first cycle and the first cycle used NHT where the first cycle increased the average percentage of student activity by 59,6%, in the second cycle become 75,1% and the second meeting of the second cycle of all student has reached a minimum of activity with both criteria. Mathematic learning achievement of student also increased from an average value of 50,5% prasiklus. In the first cycle and increased to 71,9% to 78,8 in the second cycle with a percentage of 77,8% completeness. Therefore, the teachers are advised to implement NHT in an effort to increase the activity and student achievement in math.

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PENINGKATAN AKTIVITAS DAN PRESTASI BELAJAR MATEMATIKA DENGAN NUMBERED HEADS TOGETHER SISWA KELAS VII B SMP MUHAMMADIYAH 9 YOGYAKARTA TAHUN AJARAN 2013/2014