<![CDATA[The purpose of this study was to describe the types of student errors and the factors causing the errors made by the X IPS class students of SMA Negeri 1 Pamona Timur. This type of research is qualitative research. The subjects of this study consisted of 3 students of class X IPS at SMA Negeri 1 Pamona Timur. The results of this study indicate the mistakes made by students in solving the composition function questions in the form of conceptual errors (writing errors were asked not in accordance with the question request, did not understand well the substitution method, did not understand the concept of the composition function, did not write down the unit) and procedural errors (wrong in multiplication operations, not understanding the steps for solving, not continuing the work to the end, not writing down was known and asked, wrong in multiplication and addition operations, not being careful in solving problems). Some of the factors that cause students to make mistakes are (1) not understanding the concept. (2) students have difficulty changing answer into other forms. (3) nor careful in performing arithmetic operations. (4) do not understand the concept of units. (5) incorrectly used procedures. (6) students only solve the questions until the stage is understood. (7) students are in a hurry to work on the questions. (8) don’t do the questions carefully]]>
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