Jurnal Gantang https://ojs.umrah.ac.id/index.php/gantang <p>Jurnal Gantang is published by Universitas Maritim Raja Ali Haji, Tanjungpinang, Kepulauan Riau, Indonesia. The articles written for Jurnal Gantang are state-of-the-art research articles in the field of Mathematics Education. Starting in 2022, Jurnal Gantang will be published in May and November twice a year. Jurnal Gantang is a journal with a blind review system that is an essential aspect of disseminating knowledge. Jurnal Gantang has been nationally accredited (<strong>SINTA 3</strong>) based on <strong><a href="https://drive.google.com/file/d/1zyzLry1okYQg5jU1AevYEC0q2IYTdX39/view?usp=sharing">Surat Keputusan Nomor 3/E/KPT/2019.</a> </strong><strong>Online ISSN: <a href="http://u.lipi.go.id/1481077489">2548-5547</a></strong><strong>Printed ISSN: <a href="http://u.lipi.go.id/1457412914">2503-0671</a> </strong><strong><img src="https://ojs.umrah.ac.id/public/site/images/febrian/gggggy.png" alt="gggggy.png"> Prefix: 10.31629 by<img src="https://ojs.umrah.ac.id/public/site/images/febrian/crossref_logo.png" alt="crossref_logo.png"></strong></p> <p>&nbsp;</p> Universitas Maritim Raja Ali Haji en-US Jurnal Gantang 2746-8453 Development of Teaching Module Using the Problem-Based Learning Model Based on Wadai Banjar Ethnomathematics in the Topic of Linear Equation https://ojs.umrah.ac.id/index.php/gantang/article/view/5747 <p>Many students need help to understand linear equation material and obtain low math scores. One of the efforts to overcome this was to research and produce a teaching module using a Problem-Based Learning model based on Wadai Banjar's ethnomathematics material of linear equations that is valid, practical, and effective for the learning. The type of research used is the type of 4-D model development research. The data collection technique used a validation sheet by two validators, a practicality questionnaire filled out by a math teacher and 8 students with various abilities, and a learning achievement test for 27 class VII C students of SMP Negeri 18 Banjarmasin. There are 3 analyses conducted in this study: validity, practicality, and effectiveness test analysis. The results showed an average score of 3,58 was obtained from the validator in the very valid category, an average score from the questionnaire was 3,23 in the practical category, and 66,67% of students obtained an evaluation test score above the average score in the effective category.</p> Shafitri Ardiana Noor Fajriah Juhairiah Juhairiah Copyright (c) 2023 Jurnal Gantang http://creativecommons.org/licenses/by-nc-sa/4.0 2023-06-30 2023-06-30 8 1 85 98 10.31629/jg.v8i1.5747 Classroom Action Research: What Are Mathematics Teachers’ Problems in the Implementation? https://ojs.umrah.ac.id/index.php/gantang/article/view/5673 <p>This study aims to describe the problems of mathematic teachers in doing classroom action research (CAR). Specifically, this study aims to: (1) Describe the problem of mathematics teachers in planning, implementing, and making reports on the results of classroom action research; (2) Describe the factors causing the problems of mathematics teachers in planning, implementing, and making reports on the results of classroom action research. The study applied a descriptive method. The samples were civil servant mathematics teachers who served in several State Junior High Schools, State High Schools, and State Vocational Schools in Tanjung Pinang City. Data were collected through questionnaires, interviews, and documentation. Data were analyzed and presented descriptively. Some of them were caused by: 1) being busy; 2) difficulty getting literature; 3) Lack of technology mastery; 4) the CAR training could be more optimal.</p> Nur Izzati Rindi Antika Alona Dwinata Copyright (c) 2023 Jurnal Gantang http://creativecommons.org/licenses/by-nc-sa/4.0 2023-06-30 2023-06-30 8 1 75 83 10.31629/jg.v8i1.5673 The Practicality of Plane and Space Geometry Textbook as Teaching Materials in Mathematics Education Department of UMRAH https://ojs.umrah.ac.id/index.php/gantang/article/view/5658 <p>This study aims to produce teaching materials in the Geometry of Plane and Space course integrated with the maritime context of the Riau Islands. This research is a solution to problems arising from a need for teaching materials to the characteristics of students in the Mathematics Education Department of UMRAH. The 4D model (Define, Design, Development, and Disseminate) is used as the research development model. The research has reached the final activity of the Development stage, namely the practicality test of textbooks produced. The instrument used in the practicality test is a practicality questionnaire with a Likert scale. The evaluation results show that the textbooks produced through this development research have met the applicable criteria for use as teaching materials, with an achievement level of 72,85%. Thus, the textbook produced with the title Plane and Space Geometry Textbook has met the practical to use as teaching material in the Geometry of Plane and Space course. Integrating the maritime context of the Riau Islands helps students connect the content of teaching materials with their daily life. It helps them more easily understand the new knowledge.</p> Rezky Ramadhona Nur Asma Riani Siregar Okta Alpindo Copyright (c) 2023 Jurnal Gantang http://creativecommons.org/licenses/by-nc-sa/4.0 2023-06-30 2023-06-30 8 1 65 73 10.31629/jg.v8i1.5658 Development of a HOTS-Based Mathematical Abstraction Ability Instrument in Trigonometry Using Riau Islands Province Culture https://ojs.umrah.ac.id/index.php/gantang/article/view/5654 <p>The lack of available assessment tools that effectively measure students' ability to think abstractly in mathematics, particularly in trigonometry. Additionally, there is a need to incorporate local culture into the assessment instrument to make the content more relatable and relevant to students in Riau Islands Province. This study is a development study using the Define, Design, and Develop processes from the 4D development model that have been converted to 3D. 3 doctoral lecturers in mathematics education subsequently validate the instruments produced; they are modified in response to their feedback and recommendations. A team of 17 teachers and instructors of high school mathematics validated the results, followed by panelists' validation. The content Validity Ratio (CVR) index value on the panelist's validation of 25 items is greater equals to 0.765. The instrument has been tested on 20th-grade 10<sup>th</sup> high school students. The results show that the instrument can be used on a large scale, and the instrument with the cultural context of the Riau Islands Province enables students to break down complex problems into simpler components, identify relevant variables, and establish connections between them.</p> Dwi Rismi Ocy Wardani Rahayu Makmuri Makmuri Copyright (c) 2023 Jurnal Gantang http://creativecommons.org/licenses/by-nc-sa/4.0 2023-06-30 2023-06-30 8 1 37 52 10.31629/jg.v8i1.5654 High School Students Mathematical Reasoning Ability in Solving Three Dimensional Problems https://ojs.umrah.ac.id/index.php/gantang/article/view/5651 <p>The purpose of this study was to describe students' high initial ability, moderate initial ability, and low initial ability mathematical reasoning abilities. The reality in the field shows that students' mathematical reasoning skills in 3D materials are still low and still need to be improved. The subjects in this study were class XII students of SMKF Pekanbaru City totaling 32 students, Riau Province. The research method uses a qualitative descriptive approach. Data collection techniques using written tests, documentation, and interviews. Data analysis using qualitative descriptive analysis by preparing and organizing various kinds of student error data based on each indicator of mathematical reasoning. The results of the research on students' mathematical reasoning ability on each indicator in order are; (1) Presents mathematical statements in pictures 83.3%; (2) Provide reasons or evidence for one or more solutions 55.6%; (3) Make a guess 61.1%; (4) Draw conclusions from statements 63.9%; (5) Checks the validity of an argument 73.6%; and (6) drawing conclusions from several statements 56.5%. The results of this study indicate that mathematical reasoning ability in 3D material in this study 4 indicators are still classified as low. while 2 of them are classified as high.</p> Yodiatmana Yodiatmana Atma Murni Nahor Murani Hutapea Copyright (c) 2023 Jurnal Gantang http://creativecommons.org/licenses/by-nc-sa/4.0 2023-06-30 2023-06-30 8 1 53 64 10.31629/jg.v8i1.5651