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This article analyzes the misconceptions in carrying out arithmetic series operations that occur among students in the PGMI 3 class at UIN North Sumatra. The method used in this research is descriptive qualitative with an observation approach and written tests. Regarding the problem formulation in this research, namely (1) what misconceptions about working on arithmetic series operations occur among PGMI 3 UIN North Sumatra students; (2) how can misconceptions about working on arithmetic series operations be detected among PGMI 3 UIN North Sumatra students; and (3) how many PGMI 3 UIN North Sumatra students are classified as understanding or not understanding the concept of working on arithmetic series operations. Regarding the research results, it shows that (1) misconceptions about working on arithmetic series operations can occur because students have low memory, understanding and accuracy; (2) misconceptions about working on arithmetic series operations can be detected because there are different answers between students; (3) the number of students who are classified as understanding the concept of working on arithmetic series operations is around 47% and students who do not understand the concept of working on arithmetic series operations is around 52%.

This study aims to identify misconceptions that may occur in working on arithmetic series operations among PGMI-3 students at UIN North Sumatra. Arithmetic series are an important topic in mathematics that is often used in various scientific contexts. However, misconceptions in understanding and performing arithmetic series operations can be an obstacle to strong understanding and problem-solving abilities. This research uses survey and test methods to identify misconceptions that generally arise when PGMI-3 students work on arithmetic series operations. The research results show that there are several misconceptions involving understanding the general formula for arithmetic series, calculating the nth term, and adding terms in a series. Most of these misconceptions are related to an inaccurate understanding of the basic concepts of arithmetic series. This study also attempts to identify factors that may contribute to these misconceptions, including teaching methods, teaching materials, and students' educational background. The results provide important insights for the development of curricula and teaching approaches that are more effective in understanding arithmetic series operations. With a better understanding of the misconceptions that may arise in working on arithmetic series operations, appropriate action can be taken to overcome this problem and help PGMI-3 students at UIN North Sumatra develop a better understanding of mathematics. This research also has implications in the broader context of mathematics education in Indonesia.