<![CDATA[This study aims to find out the understanding of mathematical concepts students learn by using Model Cooperative Learning Numbered Heads Together type is better than the understanding of mathematical concepts students learn by using conventional learning in class VIII SMPN 15 Padang. Type of research is Quasi-Experimental Research with the study design static group design. The study population was students of class VIII SMPN 15 Padang. Sampling techniques was random sampling, assigned to class VIII.7 as the experiment class and class VIII.6 as the control class. Instrument of research is a final test of students' understanding of mathematical concepts. Data analysis used U Mann Whitney test. Based on the data analysis test of understanding of mathematical concepts, obtained P-value = 0.0466 less than the 0,05 significance level. So it can be concluded that the understanding of mathematical concepts students learn by using Model Cooperative Learning Numbered Heads Together type is better than the understanding of mathematical concepts students learn by using conventional learning. Thus, it can be said that there is influence of cooperative learning model Numbered Heads Together type to understanding mathematical concepts of students.Keywords : Understanding of Mathematical Concept, Numbered Heads Together, Conventional Learning]]>
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