Observation results at SMP Negeri 4 Alla Enrekang Regency obtained facts that refer to the learning process there are still many problems that can be seen from the results of learning. This issue is issued: the teacher still uses conventional methods and student learning outcomes are still low. While the results of questions and answers with natural science subject teachers the average learning outcomes of students of class IX B of SMP Negeri 4 Alla in the 2018/2019 academic year at the start of the odd semester were still very low. The problem arises because the teacher's teaching model is still monotonous, that is, teachers are more active than their students. This of course will have an impact on meaningful learning that leads to successful learning. This research is a classroom action research (CAR) consisting of planning, implementing, observing, and reflecting. The research subjects were students of class IX B SMP Negeri 4 Alla Enrekang in the 2018/2019 academic year. Student learning outcomes use essay tests at the end of each cycle. The results showed that the implementation of the NHT (Numbered-Head-Together) type of cooperative learning model could improve the learning outcomes of Science IX Class B students of SMP Negeri 4 Alla Enrekang.
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