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All Journal JUPE : Jurnal Pendidikan Mandala Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram
Ruamba, Marthinus Y.
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Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Mathematics Physics Other

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Model Implementation Numbered Head Together On The Material Of Straight-Line Equations Through One Point Class Viii Nafsiah, Nur Rosatin; Hadiyanti, Yosefin R.; Tandililing, Pitriana; Panjaitan, Agnes Teresa; Ruamba, Marthinus Y.
JUPE : Jurnal Pendidikan Mandala Vol 10, No 2 (2025): JUPE : Jurnal Pendidikan Mandala (Juni)
Publisher : Lembaga Penelitian dan Pendidikan Mandala

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58258/jupe.v10i2.8974

Abstract

This research is a descriptive research using a qualitative research approach. The subjects of this research were 26 students of class VIII A SMP Al Ihsan Yapis Kotaraja. The selection of research subjects used the purposive sampling techniques. The research instruments used were teacher observation sheets, student observation sheets, and individual tests. The purpose of this research is to describe the application of the Numbered Head Together (NHT) learning model to the straight line equation material through one point in class VIII A SMP Al Ihsan Yapis Kotaraja. Based on the results of the analysis and discussion of the learning process by applying the Numbered Head Together (NHT) learning model, it went well. This is evidenced by the results of the teachers observations obtained the category of very good, the activeness of students obtained the high category, and the results of individual tests can help students to understand the material of straight line equations through one point. 
Mathematical Communication of Vocational High School Students in Solving Papuan Ethnomathematics-Based Problems Tyas, Dewi Kristika Findia Ning; Ruamba, Marthinus Y.; Agustin, Ririn Dwi; Pujilestari, Pujilestari
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol. 14 No. 1: January 2026
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v14i1.17783

Abstract

This study examines how Indonesian vocational high school (SMK) students communicate mathematically while solving systems of three-variable linear equations (SPLTV) embedded in Papuan ethnomathematical contexts. Using a qualitative descriptive design, the study involved ten Grade 10 students representing ten vocational departments. Data were collected through students’ written solutions to ethnomathematics-based SPLTV tasks (e.g., contexts involving culturally familiar objects such as noken and local economic practices) and follow-up semi-structured interviews intended to clarify students’ reasoning, procedural choices, and interpretation of results. Analysis employed a rubric-guided coding scheme comprising three observable indicators of mathematical communication: (1) mathematical expression/modeling (translating contextual information into variables and SPLTV equations), (2) identifying relevant information and coherently explaining solution procedures, and (3) drawing contextual conclusions that interpret solutions in relation to the problem situation. To ensure consistent reporting, each indicator was evaluated by evidence source written work (W), interview evidence (I), or both (W+I) allowing the study to distinguish between students who understood an element but did not document it in writing. Findings indicate that all participants were able to construct an SPLTV model from the cultural context, and most were able to explain elimination–substitution procedures, although several omitted key communication components (e.g., “given/asked” statements or an explicit concluding sentence) in their written work. Overall, eight of ten students produced a valid contextual conclusion when evidence from written work and/or interviews was considered, whereas two students struggled with core procedural steps and therefore could not reach a meaningful conclusion. These results suggest that Papuan cultural contexts can support meaning-making and initial modeling, but explicit support for procedural fluency and written communication norms remains necessary to produce complete, accountable solutions.
Co-Authors Dewi Kristika Findia Ning Tyas Hadiyanti, Yosefin R. Nafsiah, Nur Rosatin Panjaitan, Agnes Teresa Pitriana Tandililing Pujilestari, Pujilestari Ririn Dwi Agustin