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All Journal Martabe : Jurnal Pengabdian Kepada Masyarakat Journal of Educational Research and Evaluation Brillo Journal Jurnal Pengabdian Sains dan Humaniora Jurnal Pengabdian Pada Masyarakat International Journal of Didactic Mathematics in Distance Education
Ditasona, Candra
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Journal : Journal of Educational Research and Evaluation

 1 
Learning Obstacle to Ontogeny of Mathematics Teacher Candidates on Number Theory Natalia, Stevi; Darhim; Kusumah, Yaya S.; Ditasona, Candra
Journal of Education Reseach and Evaluation Vol 7 No 3 (2023): August
Publisher : LPPM Undiksha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jere.v7i3.66629

Abstract

Prospective mathematics teachers must have the characteristics of mathematical science, namely systematic, logical, and critical. This study aims to reveal the analysis of learning obstacles experienced by prospective mathematics teachers in number theory lectures with sub-material of division relations, FPB and KPK. This research uses a qualitative approach method in descriptive form. This research was conducted by collecting data through questionnaires and interviews and validated using the triangulation method. The study was limited to the analysis of ontogenic learning obstacles according to Brosseasu. The results of this study were that 4 out of 6 research subjects experienced the occurrence of ontogenic learning obstacles with details of 37.5% of prospective teacher students experiencing psychological ontogenic obstacles and instrumental ontogenic obstacles, then 25% experiencing didactic ontogenic obstacles. This indicates that students' readiness to take part in number theory courses is still weak. Students are weak in terms of psychological readiness, weak in readiness for complete mastery of related material previously studied and weak in terms of following the thought process needed in this course.
Exploring Ethnomathematics in Batak Toba Carvings for Locally-based Mathematics Teaching Material Ditasona, Candra
Journal of Education Reseach and Evaluation Vol 7 No 3 (2023): August
Publisher : LPPM Undiksha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jere.v7i3.66787

Abstract

As one of the traditional ornaments of the Batak Toba tribe, "gorga" carries philosophical meaning and serves to embellish the decoration of traditional houses. The gorga motif has its own distinctive characteristics, with closely arranged patterns and symmetrical designs. This indicates the presence of mathematical aspects within these carved gorga patterns. This research aims to analyze the symmetries embedded in the gorga motifs that can be utilized as locally-based mathematics teaching material. The study is conducted by exploring various gorga motifs and analyzing their types of symmetry. The research is employing an ethnographic research approach. Data is collected through observing buildings adorned with gorga motifs, studying literature, and conducting interviews with gorga carvers. Qualitative data analysis can be started with data reduction, data presentation, drawing conclusions and verification. The research findings reveal the existence of seven types of symmetry obtained from all gorga motifs. These symmetry types include translation symmetry, glide reflect symmetry, vertical symmetry, rotation 180° symmetry, vertical and  rotation 180° symmetry, horizontal symmetry, and vertical and horizontal symmetry.
Co-Authors Bryan C Tugelida, Nel Dameria Sinaga Daniel, Stepanus Darhim Darhim Familia Novita Simanjuntak Han Nio, Tan Hendrikus Male, Hendrikus Junsay, Merle Kristina, Nugra Heni Manogari Sianturi Melda Simorangkir, Melda Metallica, Christina Novita Simanjuntak, Familia Pardosi, Deborah Purba, Santri Chintia Rian Nugroho, Andreas Setiawan, Laurencia Firstania Simbolon, Kerdid Stevi Natalia, Stevi Sunarto Sunarto Susilo Susilo Tugelida, Nel Bryan C Yaya S. Kusumah