<![CDATA[This study aimed at describing the errors of students in solving problems in the matrix material in terms of students’ reasoning ability. This type of research is a qualitative approarch with a descriptive research methodology that aims at determining the description of the analysis of errors and differences in errors made by students in solving mathematical problems. The subjects of this study were 30 students of class X in SMA N 2 Tanjungbalai in the academic year of 2019-2020. The test instrument used in this study was in the form of 5 question test that referred to indicators of reasoning ability including (1) presenting mathematical statements in writing, diagrams or pictures. (2) construct valid arguments. (3) give reasons for the truth of the solution. (4) draw conclusions form logical statements. Based on the results of the study it can be concluded that students made errors in answering question number 1 as much as 53%, students’ errors in answering question number 2 as much as 53%, students’ errors in answering question number 3 as much as 46%, students’ errors in answering question number 4 as much as 30%, and students’ errors in answering question number 5 as much as 53%. As for the errors in each indicator that is 7,3% errors in indicator 1, 30,6% errors in indicator 2, 28% errors in indicator 3, and 28,6% errors in indicator 4.]]>
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