<![CDATA[The purpose of the study to describe the process of cooperative learning Numbered Heads Together (NHT) in order to increase learning activity and mathematics achievement of class VII D SMP N 1 Nglipar. This research was Classroom Action Research (CAR) conducted a minimum of two cycles. The subjects of this study were students of class VII D SMP N 1 Nglipar totaling 32 students. The object of this study were learning activity and mathematics achievement. The results showed that learning activity and mathematics achievement have increased. This is indicated by the average percentage of observation sheet result of student learning activity by 60,93% first cycle and 81,77% in the second cycle. Results of students mathematics learning achievement test, the average value of mathematics learning achievement at 57,18 pre-cycle, the first cycle increased to 69,44 and the second cycle increased to 74,56. Based on the results of the implementation of cooperative learning Numbered Heads Together (NHT) model can increased learning activity and mathematics achievement.]]>
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