IndoMath: Indonesia Mathematics Education 2021-02-09T11:19:25+07:00 Sri Adi Widodo Open Journal Systems <div id="journalDescription"> <div id="journalDescription"><hr /> <table class="data" bgcolor="#f0f0f0"> <tbody> <tr valign="top"> <td width="30%">Journal title</td> <td width="70%"><strong> IndoMath: Indonesia Mathematics Education </strong></td> </tr> <tr valign="top"> <td width="30%">Frequency</td> <td width="70%"><strong>Two issues per year (February and August)</strong></td> </tr> <tr valign="top"> <td width="30%">DOI</td> <td width="70%"><strong>Prefix 10.30738 by Crossref<br /></strong></td> </tr> <tr valign="top"> <td width="30%">Print ISSN</td> <td width="70%"><strong><a href=";1515737386&amp;1&amp;&amp;">2614-5103</a></strong></td> </tr> <tr valign="top"> <td width="20%">Online ISSN</td> <td width="70%"><strong><a href=";1515737631&amp;1&amp;&amp;"><strong>2614-5111</strong></a></strong></td> </tr> <tr valign="top"> <td width="30%">Editor-in-chief</td> <td width="70%"><a href=""><strong>--</strong></a></td> </tr> <tr valign="top"> <td width="30%">Managing Editor</td> <td width="70%"><a href=""><strong>Dr. Muhammad Irfan, S.Si., M.Pd</strong></a></td> </tr> <tr valign="top"> <td width="30%">Publisher</td> <td width="70%"><strong><a href="" target="_blank" rel="noopener"><strong>Universitas Sarjanawiyata Tamansiswa</strong></a></strong></td> </tr> <tr valign="top"> <td width="30%">Citation Analysis</td> <td width="70%"><a href=";hl=id" target="_blank" rel="noopener"><strong>Google Scholar</strong></a></td> </tr> </tbody> </table> </div> </div> The Development of Calculus Teaching Materials using Geogebra 2021-02-09T08:46:54+07:00 Ari Septian Darhim Darhim Sufyani Prabawanto <p><em>The purpose of this study is to find out the calculus teaching material using GeoGebra, knowing the results of expert validation in terms of multimedia and material, and knowing the effectiveness of using calculus teaching material using GeoGebra. The research method used is research and development. The research subjects were 155 students in Departement of Mathematics Education at Universitas Suryakancana. The results of the validation of media experts using the Kendall test, sig. = 0.062 &gt; 0.05 (Ho accepted) means that the calculus teaching material using GeoGebra is feasible to use. The results of the validation of the material using the Kendall test, sig. = 0.065 &gt; 0.05 (Ho accepted) means that the material content is appropriate. The results of tests on 155 students in Departement of Mathematics Education at Universitas Suryakancana, an average percentage of 78% of students answered strongly agree and 15% answered agreed, meaning that calculus teaching material using GeoGebra is effectively used.</em></p> 2021-02-01T00:00:00+07:00 Copyright (c) 2021 Ari Septian, Darhim Darhim, Sufyani Prabawanto Ethnomathematics Based Geometry Module Development With a Scientific Approach to Improve Students' Metacognition Ability 2021-02-09T08:46:54+07:00 Achmad Mutaqin Mohammad Syaifuddin Yus Mochamad Cholily <p><em>This study aims to develop a geometry module based on ethnomathematics with a scientific approach, test the module's validity and feasibility, and determine the effect of using modules in learning on students' metacognitive abilities. This study uses a research and development (R&amp;D) approach with a 4D model (define, design, develop, and disseminate). The research subjects were students of 8<sup>rd</sup> Junior High School in Malang. Data analysis of the effect of the use of modules on metacognition abilities using the paired sample t-test. The research results showed the ethnomathematics based geomery module with a scientific approach is valid, developed by with a 4D model. The module is also categorized as effective for use in learning activities. The ethnomathematics based geometry modules with a scientific approach has an effect on metacognition abilities. </em></p> 2021-02-01T00:00:00+07:00 Copyright (c) 2021 Mohammad Syaifuddin, Achmad Mutaqin, Yus Mochamad Cholily Analysis of Creative Thinking Abilities of Prospective Mathematics Teachers in Solving and Posing Quadrilateral Open-ended Problems 2021-02-09T08:46:54+07:00 Jovitha Indah Gisbtarani Veronika Fitri Rianasari <p>Prospective teachers are required to develop their creative thinking abilities. The creative thinking abilities can help prospective teachers in designing the learning process, one of which is in designing non-routine problems as an evaluation of learning. This study aims to describe the creative thinking abilities of six sixth-semester students of Mathematics Education at Sanata Dharma University in solving and posing open-ended problems on the topic of quadrilateral. Data collection methods used are written tests to solve and pose open-ended problems and interviews. Data analysis adopted the framework of qualitative data analysis namely <em>data reduction</em>, <em>data display</em>, and <em>conclusion drawing</em>. The results showed that (1) the students' creative thinking abilities in solving open-ended quadrilateral problems were categorized into four categories namely very poor (1 student), poor (3 students), fair (2 students) and good (1 student), (2) the students' creative thinking abilities in posing open-ended quadrilateral problems were categorized into three categories of creative thinking abilities namely very poor (2 students), poor (1 student) and very good (3 students).</p> 2021-02-01T00:00:00+07:00 Copyright (c) 2021 Veronika Fitri Rianasari Feasibility of RME-Based Bilingual E-Module on 3D Shapes with Curved Surfaces 2021-02-09T08:47:56+07:00 Pitriani Pitriani Putra Pratama <p>A bilingual e-module that is systematically structured and linked to contextual problems can help students learn independently anywhere and anytime, especially in a pandemic that applies distance learning. RME is an approach that views mathematics as an activity/ process in contextual problems so that students find their own understanding. This study examines the feasibility of an RME-based bilingual e-module on 3D shapes with curved surfaces materials from expert judgment on material, language, and media. This research model is the ADDIE model. There are 6 validators (2 material experts, 2 media experts, and 2 linguists). The research instrument was in the form of assessment based on expert judgement. The results showed that both material, media, and language used for the RME-based bilingual e-module is "feasible” to use in mathematics learning.</p> 2021-02-01T00:00:00+07:00 Copyright (c) 2021 Pitriani Pitriani, Putra Pratama Ethnomathematics: Utilization of Crock, Ladle, and Chopping Board for Learning Material of Geometry at the Elementary School 2021-02-09T08:46:54+07:00 Ahmad Faqih Odi Nurdiawan Andi Setiawan <p>Mathematics and culture are not mutually exclusive. They work well together. It is because the help of ethnomathematics. Ethnomathematics is a learning approach of mathematics seeking a cultural approach in mathematical concepts.  This study aims at exploring the shape of the crock (earthenware jar), ladle, and chopping board associated with learning materials of the two-dimensional and three-dimensional figure at the elementary school level. The research method used was descriptive qualitative, conducted adopting an ethnographic approach. The ethnographic approach consists of three stages: selection, writing and exploration. The study results found that the shape of the crock (earthenware jar), ladle, and chopping board contained mathematical elements, which are two-dimensional figure including circles and rectangles as well as three-dimensional figure including cuboid, cone and ball.</p> 2021-02-01T00:00:00+07:00 Copyright (c) 2021 Ahmad Faqih Conceptual Understanding of Complex Analysis Number using Flipped Learning 2021-02-09T08:46:54+07:00 Fariz Setyawan Siti Nur Rohmah <p><em>Flipped Learning is one of the alternatives of teaching and learning approach in mathematics classroom. The objective of this study is exploring students’ conceptual understanding about complex number using flipped learning with handout. The subject of the study are the students in 5<sup>th</sup> semester students of mathematics education department in 2019/2020. The study used qualitative approach to describe the implementation of flipped learning.</em></p><em>There are 31,6% of 19 respondents give score very satisfied. This result then observed by using the test with all the students understand with the definition of complex numbers. Besides they can adapt their learning activity using flipped learning with complex analysis handout. As legibility aspect of the handout, there are 52,6% of the respondents gives score satisfied and 26,3% of the respondents are very satisfied. The score indicates that the flipped learning with handout helps students to understand about the complex number concepts.</em> 2021-02-02T00:00:00+07:00 Copyright (c) 2021 Fariz Setyawan, Siti Nur Rohmah Depicting Epistemological Obstacles in Understanding the Concept of Sequence and Series 2021-02-09T11:19:25+07:00 Samsul Maarif Krisna Satrio Perbowo Rahmat Kusharyadi <p>This study aimed to discover epistemological obstacle on secondary students to solve sequence and series problems based on three indicators, there are a conceptual obstacle, procedural obstacle, and operational technique obstacle. This study was descriptive with qualitative research approaches. Data were collected with the test and interview method. The subjects in this study are students of SMP Negeri 86 Jakarta class VIII based on the errors seen from the diagnostic tests that had been tested. The analysis was done by giving written tests which are essay and interview formatted. Results on analysis showed that: (1) Conceptual obstacle, obstacle that was experienced by students are: students considered that a pattern was said as a numeral pattern because they own odd numeral pattern and own 2,2,2 of difference; were not able to find exact pattern within the problem; considering that Fibonacci numeral sequence was a pattern that form prime numeral pattern; were not able to differ the concept of arithmetics and geometry sequence; were not able to understand the concept of first quarter on arithmetics sequence; error when interpreted the meaning of problems; were not able to intepret what was given on mathematics model; interpreting sum of the first 20 quarters with sequences which own the 20th quarter; and interpreting sum of the first 20 quarters with the 20th quarter; (2) While on procedural obstacle, obstacle that was experienced are: interpreting numeral pattern if they own their pair; error on determining multiplication or difference; and applying formulas incorrectly; (3) Last on operasional technique obstacle, obstacle that was experienced are error on calculation and using sign and symbol mathematics incorrectly.</p> 2021-02-09T00:00:00+07:00 Copyright (c) 2021 Samsul - Maarif, Krisna Satrio Perbowo, Rahmat - Kusharyadi