Abstrak
This study aimed to determine the significant effect of Number Heads Together (NHT) Model to students’ competency in understanding natural sciences materials. The samples are categorized into two groups which are high preliminary knowledge and low preliminary knowledge. The two groups will compare between class with NHT Models and conventional Models. This research uses pra-experimental design. The Population of the research is Junior High School students of SMPN 2 Batang Anai who registered in 2016/2017 academic years. The students were given pretest and posttest. The Data is analyzed using two ways ANNAVA. Based on data analysis, it can be concluded that there are significant differences between students Who taught with NHT Models and conventional models.