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All Journal Jurnal Absis : Jurnal Pendidikan Matematika dan Matematika Randwick International of Education and Linguistics
Muhammad Amin Fauzi
Universitas Negeri Medan, Indonesia
Arts Education Languange, Linguistic, Communication & Media Mathematics Other

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Use of The Canva Application to Develop LKPD Based on CTL in Geometry in Mathematics Subject Cindi Safitra Saragih; Muhammad Amin Fauzi; Wildansyah Lubis
Randwick International of Education and Linguistics Science Journal Vol. 5 No. 2 (2024): RIELS Journal, June
Publisher : RIRAI Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47175/rielsj.v5i2.1006

Abstract

Mathematics is a basic science that has a very important influence on life, because mathematics can prepare and develop students' abilities to think logically, flexibly and precisely to solve problems in their daily lives. This research is research into the development of mathematics worksheet for elementary school students. The aims of this research were to 1) determine the validity of CTL-based LKPD on cube and block materials; 2) find out the practicality of CTL-based LKPD on cube and block materials; and 3) determine the effectiveness of CTL-based LKPD on cube and block materials. This research was conducted at SD Negeri 101964 Jaharun A with research subjects namely 25 class V students. The validators in this research consisted of material experts, media experts and language experts. Teachers and students as product users test the practicality of CTL-based LKPD. This type of research is research and development with the ADDIE model (Analyze, Design, Development, Implementation, and Evaluation). The research instruments used were interviews, validation sheets, teacher and student response questionnaires, as well as test instruments in the form of test essays. The data collection techniques in this research are interviews and tests, with data analysis techniques for testing validity, level of difficulty, distinguishing power, and reliability for test instruments, and n-gain tests. The results of this research show that the CTL-based LKPD is declared feasible because it meets the criteria of being valid, practical and effective for use in teaching mathematics regarding cubes and blocks.
Students' errors in solving plane geometry problems: A Newman's error analysis approach Naftali Marbun; Renata Siburian; Nabila Nasution; Syeila Fatiha; Reva Lenita Girsang; Artorito Sitorus; Muhammad Amin Fauzi
Jurnal Absis: Jurnal Pendidikan Matematika dan Matematika Vol. 8 No. 2 (2025): Jurnal Absis
Publisher : Program Studi Pendidikan Matematika Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30606/absis.v8i2.3304

Abstract

This study aims to analyze students' errors in solving plane geometry problems using Newman's Error Analysis (NEA), with a focus on identifying specific error patterns that hinder learning. Geometry is a fundamental component of mathematics, yet many students struggle to master concepts involving plane figures and the distance from a point to a line. This research employed a descriptive qualitative design with nine second-semester mathematics education students at Universitas Negeri Medan in the 2024/2025 academic year as subjects. Based on test results, three students with the lowest scores were selected for in-depth analysis. The research instruments consisted of essay- and context-based geometry problems, validated by expert lecturers and piloted for clarity. Data were collected from students' written responses and analyzed using the Miles and Huberman model, which includes data reduction, data display, and conclusion drawing. The findings revealed five categories of errors: reading, comprehension, transformation, process skills, and encoding. Among these, comprehension errors and process skills errors were the most dominant, reflecting students' difficulties in interpreting information and applying accurate solution procedures. This study contributes to the literature by providing detailed insights into students' error patterns in plane geometry and highlighting the value of NEA as a diagnostic tool to inform targeted instructional strategies and improve mathematics learning outcomes.
Co-Authors Artorito Sitorus Cindi Safitra Saragih Nabila Nasution Naftali Marbun Renata Siburian Reva Lenita Girsang Syeila Fatiha Wildansyah Lubis