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All Journal Journal of Education and Learning (EduLearn) Polyhedron International Journal in Mathematics Education The International Journal of Mathematics and Sciences Education
Jenisus O. Dejarlo
University of Rizal System
Humanities Education Library & Information Science Mathematics Social Sciences Other

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Ways of thinking 3D geometry: exploratory case study in junior high school students Sudirman Sudirman; Camilo Andrés Rodríguez-Nieto; Zwelithini Bongani Dhlamini; Alok Singh Chauhan; Umida Baltaeva; Abdulhalim Abubakar; Jenisus O. Dejarlo; Mela Andriani
Polyhedron International Journal in Mathematics Education Vol. 1 No. 1 (2023): pijme
Publisher : Nashir Al-Kutub Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59965/pijme.v1i1.5

Abstract

Each student has their own characteristics and way of doing 3D geometric thinking. The way of thinking that students do influences the resulting understanding of the concept of 3D geometry. Therefore, this study aims to investigate students' geometric thinking based on the level of achievement of students in completing the 3D geometric thinking ability test (3D GTA). This study uses an exploratory case study design. The participants who voluntarily participated were 33 junior high school students (14 boys, 19 girls) in one of the schools in Indramayu Regency, Indonesia. Data obtained from the process of observation, tests, interviews, and documentation were analyzed qualitatively using Atlas. ti 8 software. The findings revealed that students with low 3D GTA achievements experienced difficulties in representing and calculating the surface area and volume of 3D shapes. In addition, students with moderate 3D GTA achievements experienced difficulties in representing 3D shapes but were able to translate 2D shapes from 3D shapes. Furthermore, students with high 3D GTA achievements experienced difficulties in calculating the surface area and volume of 3D shapes, but were able to use appropriate formulas and were able to interpret the comparisons of 3D geometric shapes well. The results of this study have implications for helping teachers identify student characteristics in understanding the concept of 3D geometry and connections with 2D geometry.
Connection ethnomathematics and ethnomodeling in the bocah sukerta traditional ceremony, Indonesia Sudirman Sudirman; Ebenezer Bonyah; Jenisus O. Dejarlo; Runisah Runisah; Nandang Nandang; Rosyadi Rosyadi; Mochammad Taufan; Anzzal Ibrahim
Journal of Education and Learning (EduLearn) Vol 20, No 2: May 2026
Publisher : Intelektual Pustaka Media Utama

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/edulearn.v20i2.21872

Abstract

This research aims to identify and reveal the connection between ethnomathematics and ethnomodeling in Indonesia’s bocah sukerta traditional ceremony. An ethnographic design was used to reveal the research objectives. The participants involved in this research were the ceremony leader and bocah sukerta. Next, the data obtained from interviews and observations were analyzed using the content analysis method. The research results reveal that the ethnomathematics connection is reflected in weighting activities (weighing objects, calculating total weight, making comparisons, and balancing weights) and the shape of the scales (the basic shape represents 2D geometry, and the frame shape represents 3D geometry). This research also concludes that the ethnomodeling connection produces mathematical understanding, especially in arithmetic operations, weight measurements, weight conversions, mathematical equations, basic statistics, Cartesian coordinates, the center point of a square, and determining a pyramid’s distance, length, and area. Furthermore, this research concludes that the relationship between ethnomathematics and ethnomodeling in the bocah sukerta traditional ceremony can be used to construct didactic designs for square material volumes and rectangular pyramids.
Developing and validating an ethnomathematics-based learning module from the traditional house and accessories of the Dayak Bumi Segandu Indramayu Tribe for junior high school students Nandang Nandang; Mochammad Taufan; Mellawaty Mellawaty; Runisah Runisah; Ratna Sri Rahayu; Ronaldo Rafael Olivero-Acuña; Jenisus O. Dejarlo
Polyhedron International Journal in Mathematics Education Vol. 4 No. 1 (2026): pijme
Publisher : Nashir Al-Kutub Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59965/pijme.v4i1.311

Abstract

Ethnomathematics research has documented mathematical concepts embedded in various Indonesian cultural artifacts; however, few studies have transformed these findings into validated instructional materials, and the traditional houses and accessories of the Dayak Bumi Segandu Indramayu community remain unexplored in mathematics education literature. This study addressed this gap by combining an ethnographic exploration with the ADDIE development model to design and validate an ethnomathematics-based learning module on three-dimensional geometry for seventh-grade junior high school students. The research was conducted at Padepokan Nyi Ratu Kembar Jaya, Krimun Village, Indramayu Regency. Data were collected through observations, interviews, and documentation involving four purposively selected participants representing the community leadership and members. Qualitative data were analyzed using coding, data reduction, data display, and conclusion drawing assisted by ATLAS.ti 8. The exploration identified mathematical concepts embedded in traditional houses and cultural accessories, including lines, angles, plane figures, and solid figures, which were integrated into the module. Validation by two mathematics education experts yielded an average score of 72.8% (Good), indicating satisfactory conceptual and pedagogical quality, although improvements were recommended for language clarity. Practicality evaluation by two mathematics teachers produced an average score of 95.5% (Strongly Agree), demonstrating high classroom usability. These findings indicate that the cultural heritage of the Dayak Bumi Segandu Indramayu community can be systematically transformed into a valid and practical mathematics learning resource while contributing to the preservation of local knowledge through school mathematics.
Exploring the effectiveness of modified algebra tile media in teaching single-variable linear equations: a case study Adinda Quin Berliana; Puguh Darmawan; Syekha Vivi Alaiya; Jenisus O. Dejarlo
International Journal of Mathematics and Sciences Education Vol. 2 No. 2 (2024): Ijmsed
Publisher : Nashir Al-Kutub Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59965/ijmsed.v2i2.144

Abstract

Single-variable linear equations are open mathematical sentences that contain only one variable raised to the power of one and are connected by an equals sign (“=”). This topic is often perceived as challenging by students, highlighting the importance of exploring innovative teaching strategies. This study examines the implementation of modified algebra tile media to enhance student understanding of single-variable linear equations. A qualitative case study approach was employed, involving a subject group consisting of student practitioners and 36 student observers. The research procedure included developing the modified algebra tile media followed by its application in teaching single-variable linear equations. Data were collected using the media, video recording devices, and field notes from the supervising lecturer. Interactive data analysis techniques revealed that the use of modified algebra tile media significantly facilitated students' comprehension of single-variable linear equations. By enabling hands-on manipulation of the media, students no longer needed to rely solely on abstract visualization of variables. These findings suggest that incorporating tangible, interactive teaching tools can effectively address learning difficulties in mathematics, particularly for abstract concepts.
Co-Authors Abdulhalim Abubakar Adinda Quin Berliana Alok Singh Chauhan Anzzal Ibrahim Camilo Andrés Rodríguez-Nieto Ebenezer Bonyah Mela Andriani Mellawaty Nandang Puguh Darmawan Ratna Sri Rahayu Ronaldo Rafael Olivero-Acuña Rosyadi Runisah, Runisah Sudirman Sudirman Sudirman Syekha Vivi Alaiya Taufan, Mochammad Umida Baltaeva Zwelithini Bongani Dhlamini