ABSTRACT  Background of this research are the student disable to share their knowledge with their friends in the classroom, and the students understanding of mathematical concepts  are still  low,  the solution  is  the researcher  try to  apply an  active learning strategy tipe synergetic teaching. This study aims to determine whether students understanding of mathematical concepts by using active learning strategies synergetic type of teaching better than students understanding of mathematical concepts with conventional learning of the eight grade students at SMPN  2  Batang  Anai  Academic  Year  2013/2014.  This  research  is  an experimental study with random trials on the subject. The population in this study were students of the eight grade at SMPN 2 Batang Anai. Based on the analysis of data obtained P-value = 0,039 was smaller than α = 0,05 then reject H0, so the research hypothesis was accepted. It can be concluded that the students understanding of mathematical concepts by applying active learning strategies synergetic type of teaching better than students understanding of mathematical concepts  with  conventional  learning  of  the  eight  grade  students  at  SMPN  2Batang Anai Academic year 2013/2014.
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