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This research aims to analyze students' errors in solving quadratic equation questions based on the Kastolan classification with test instrument questions adapted to the cognitive level of Bloom's Taxonomy. The subjects of this research were six students of class IX MTsS Simpang Tanjung Nan IV. The type of research used is descriptive qualitative. Instruments include questions, interview guidelines and documentation. Based on this research, conceptual errors were found with a percentage of 58.3%, procedural errors with a percentage of 33%, and technical errors with a percentage of 25%. The dominant errors found are conceptual errors, the teacher's role is needed in preventing and overcoming these errors.

This research aims to detect grammatical errors in the undergraduate thesis of students of the Department of Arabic Language Education at Sultan Sharif Qasim Islamic State University Riau in 2017. The design of this research is a descriptive qualitative research. The data collection tools are the official documents method. In this research, the researcher analyzed the grammatical errors in the university thesis, where the researcher went through three stages, namely: 1- Recognizing the error, the researcher looked at the texts of the supplementary research written in Arabic for students of the Department of Arabic Language Education at Sultan Sharif Qasim Islamic State University in 2017, and identified the errors in which the students deviated from the grammatical rules. 2 - Correcting the error, the researcher clarified what is correct 3 - Clarifying the error, the researcher clarified what are the correct rules in the Arabic language. The results of this research are: The grammatical errors made by the students of the Department of Arabic Language Education at Sultan Sharif Qasim Islamic State University, Riau, in writing the supplementary research are many, including those related to the section of marfu’at, manshubat, majrurat, majzumat, asma` ma’rifah, tawabi’ and murakkabat. The researcher found forty-nine errors in the section of tawabi’ (na’at haqiqy) and forty errors in the section of murakkabat (tarkib idhafah). The least number of errors were found in the section of majrurat and majzumat.    

The web-based e-Attendance system with QR Code at SMK Negeri 2 Cimahi enhances student attendance monitoring digitally. By integrating QR Code technology, students easily record their attendance by scanning a QR Code on the attendance page. The system’s key advantage is automatic attendance recording, providing real-time access for teachers and administrative staff. The user-friendly interface ensures accurate monitoring and efficient data management, minimizing errors and offering a precise understanding of student attendance. The implementation of QR Code technology has improved administrative efficiency and reduced errors, leading to better insights into student attendance. Data analysis enables teachers to take appropriate actions to enhance student engagement, fostering a more responsive learning environment. Overall, the e-Attendance system significantly optimizes student attendance management in the digital era.

Mathematical proof is an important aspect in real analysis courses but is often a challenge for students. This research aims to analyze the types of errors that students often make in mathematical proofs in real analysis courses. The research method uses library research to explore the background, objectives, methods, findings and implications of the problem. The results of the analysis show that logical errors, conceptual errors, notation and writing errors, and heuristic thinking errors are the most common. These findings imply the need to develop more effective learning strategies to help students overcome difficulties in mathematical proofs. By understanding the types of errors that frequently occur, instructors can design learning methods that better suit students' needs.

Research on forecasting new student admissions at SD Negeri 10 Koto Tinggi Surian employs data analysis using simple linear regression to predict the number of new students based on previous years and formulate it into a mathematical model. In its calculation process, this approach can adopt both quantitative and qualitative methods. The prediction error rate for the next year is very low. Out of 41 predicted students, only one differs from the actual number. The study's data spans student admissions from 2019 to 2023. The research findings demonstrate the effectiveness of conventional linear regression techniques. The prediction for 2023 indicates an intake of 42 students. Therefore, it can be concluded that simple linear regression accurately predicts new student admissions at SD Negeri 10 Koto Tinggi Surian with high accuracy.    

This study focused on UNIMED Biology Department students and aimed to find Indonesian language errors in their WhatsApp conversations with lecturers. The data included messages sent by UNIMED biology students to lecturers via WhatsApp. A qualitative analysis was conducted to compare this data with language error standards set in good and correct Indonesian language rules, such as EYD, PUEBI, and KBBI. The results showed that some of the language mistakes that often occur in conversation include incorrect word use, incorrect punctuation, and ineffective sentences

A flat shape is a geometric part that only has a perimeter and area. There are various shapes of flat shapes, such as triangle, square, long, parallelogram, rhombus, kite, trapezoid, and circle. The aim of this research is to conduct a literary analysis related to the difficulties faced by students in expressing their ideas in the subject. which are given. The analysis method used is called Systematic Literature Review (SLR). Data collection was carried out by documenting and reviewing 7 national index articles; the articles are then broken down into different areas. Based on the research results, there are thirteen articles that discuss the difficulties experienced by students when solving problems related to the topic of building a flat-sided room. Based on the research results, it can be concluded that there are still problems that students often face when trying to solve problems related to the construction of flat-sided spaces. The most common types of errors are formula errors, errors in shape identification, and errors in understanding the concept of plane figures. This is caused by uneven understanding of concepts, inaccurate determination of formulations, and uneven student bias in understanding the results of flat shapes.

Misconceptions are concepts that are not relevant to scientific understanding accepted by experts in the field concerned and can cause difficulties in understanding material. The aim of this research is to examine the results of misconception analysis in working on arithmetic series operations at PGMI 3 UIN North Sumatra. 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 inaccurate understanding and lack of focus on the basic concepts of arithmetic series. The type of error that many students make is an error in determining a formula with an error percentage of 20.49% and the error being made is an error in the final result determined, with an error percentage of 17.93%. Of the 39 students, there were 24 students who answered the questions correctly and well and there were 15 students who made different mistakes.