This research aimed to determine the understanding level of the vector concept of Senior High School in Metro, Lampung province. The research populations were all students of X science Senior High School in Metro City, with the total number of schools was 27 Senior High School. The sampling technique in this research was using a stratified random sampling technique, so that obtained 288 students grade X science Senior High School at five Senior High Schools in Metro City. The five schools were SMA Negeri 1 Metro, SMA Negeri 5 Metro, SMA Kristen 1 Metro, SMAS Kartikatama Metro, and MAS Al Muhsin Metro. The result of the research shows that the students' understanding of the concept of students class X science Senior High School in the City of Metro on the subject matter of vector was included in the medium category, with the percentage of understanding concept were 58.0%, guessing were 25.0% and not understanding the concept were 17.0%. The most widely understanding subtopics of the students were a subtopic vector component with a percentage of 77.8%. The least understanding subtopics of the students were a subtopic value of vector with a percentage of 50.4%.
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