The purpose of this research is 1) to know the result of the interview with the teacher related to the understanding of methematics concept, 2) to know the result of the observation of learning related to the understanding of methematics concept, 3) to know the result of the initial test of the students related to the understanding of mathematichal concepts. The location of study is SD Negeri Rau Kedung Jepara Jawa Tengah Indonesia. The study was conducted in the even semester of May of 2018. The subjects of this study were V graders and V graders of State Elementary School which amounted to 22 students. Data collection techniques using interviews with observation teachers and tests. After obtaining data is done with kuantitative data analysis techniques and kualitative data analysis techniques. Based on interviews, observation and pretest is known that understanding of student concept is still low.
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