The purpose of this research is to know whether studentsâ understanding of mathematics concept by using Inside-Outside Circle method is better than studentsâ understanding of mathematics concept by using conventional  method for student  garade VIII of SMPN 11 Padang. The kind of this research is experimentalresearch, by using students in class VIII D and VIII E as samples which registered in 2011-2012  academic year. The instrument of this research is written test in essay form based on  the indicator of concept understanding.  Based on the data analysis to test the hypothesis, it is found that P-value 0.013  is lower than α=0.05, it means that Hois rejected and H1is accepted. So, it can be  concluded that studentsâ understanding of mathematics concept by using InsideOutside Circle method is better than studentsâ understanding of mathematics concept  by using conventional method.Key Word: Lingkaran Dalam Lingkaran Luar, Pemahaman Konsep Matematis
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