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ABSTRACT This research was aimed to know 1) Student’s achievement in physics by using numbered heads together (NHT). 2) Student’s achievement in physics by using conventional learning model. 3) The effect of numbered heads together (NHT) on student’s achievement especially on expansion topic. The population was nine classes student grade VII in SMP N 1 Tebing Tinggi. The sample was two classes obtained by cluster random sampling. The sample was VII 5 by using numbered heads together (NHT) and VII 4 by using conventional learning model. Instrument has 20 questions and tested validated. The mean of pre-test in VII 5 was 38.15 and in VII 4 was 38.52. After that learning model applied, and then done the post-test. The mean of post-test in VII 5 was 78.15 and in VII 4 was 73.52. In hypothesis testing obtained t count > t table at significant level 0.05. So, can be concluded student’s achievement of VII 5 better than VII 4 . Keyw ords : Numbered Heads Together, Student’s Achievement

COOPERATIVE TYPE NUMBERED HEADS TOGETHER EFFECT ON STUDENT’S ACHIEVEMENT IN EXPANSION TOPIC