This research aims to know the effectiveness of the application of the Cooperative model of type Numbered Heads Together (NHT) with contextual approach in the learning of mathematics in students of class VIII SMP Negeri 5 Pallangga semester academic year 2018/2019 with experimental units is the class VIII as many as 36 students consisting of 19 men and 17 women. This type of research is research pre-experiments. The design on this research is one group Pretest-Posttest (The One Group Pretest – Posttest Design) which only involves a single class. Based on the results of the study it can be concluded that the application of the Cooperative model model type Numbered Heads Together (NHT) with contextual approach effectively applied in learning mathematics in grade VIII SMP Negeri 5 Pallangga.