Students' understanding of mathematical concepts is still a challenge, especially in solving problems that require procedural and conceptual understanding, such as on the topic of circles. This study aims to analyze the types of errors made by students in solving mathematical problems on the topic of circles using the Newman's Error Analysis (NEA) procedure. The approach to this study is descriptive qualitative, conducted at SD 050661 Kwala Bingai with 20 subjects of grade VI-A. Data were collected through written tests and analyzed using five stages of NEA: reading errors, understanding, transformation, process skills, and writing final answers. The results of the study showed that most students made errors at the stages of understanding, transformation, and process skills. Factors causing errors include lack of conceptual understanding, procedural errors, and inaccuracy in solving problems. The conclusion of this study shows the need for an active role for teachers in identifying and overcoming student errors through appropriate teaching methods, especially on the topic of circles. This study is expected to provide an overview for teachers in designing appropriate learning strategies to improve students' understanding of mathematical concepts.

Character education is a system of instilling character values in school members which includes components of knowledge, intelligence or will, and actions to implement these values. Character education is a deliberate effort to build good character based on core virtues that are objectively good for individuals and society. The research method used is a qualitative method involving data collection techniques in the form of observation and interviews. The data collected was then analyzed inductively, namely by identifying patterns, themes and concepts that emerged from the data. The purpose of this literature is to determine teacher strategies and creativity as an effort to improve character education for students. The results of the research show that the improvement efforts made by teachers at RA Maghfirah have been very good, teachers always accustom children to what they have been taught. The strategy used by teacher RA Maghfirah in forming children's character is related to habitual activities. The implication of this research is that it is hoped that teachers can use various models, methods and learning media to increase students' creative thinking.