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All Journal Jurnal Pendidikan Matematika Undiksha JURNAL MATEMATIKA STATISTIKA DAN KOMPUTASI P2M STKIP Siliwangi SITEKIN: Jurnal Sains, Teknologi dan Industri Jurnal Riset Pendidikan Matematika AKSIOMA: Jurnal Program Studi Pendidikan Matematika Jurnal Teknologi Informasi dan Ilmu Komputer Al-Jabar : Jurnal Pendidikan Matematika JOIV : International Journal on Informatics Visualization KALAMATIKA Jurnal Pendidikan Matematika PRISMA Faktor Exacta Jurnal Pengabdian Pada Masyarakat Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Numeracy : Jurnal Ilmiah Pendidikan Matematika BAREKENG: Jurnal Ilmu Matematika dan Terapan JMM (Jurnal Masyarakat Mandiri) JTAM (Jurnal Teori dan Aplikasi Matematika) SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Indiktika : Jurnal Inovasi Pendidikan Matematika Martabe : Jurnal Pengabdian Kepada Masyarakat KOMPUTIKA - Jurnal Sistem Komputer Abdimas Umtas : Jurnal Pengabdian kepada Masyarakat Mathvision : Jurnal Matematika GERVASI: Jurnal Pengabdian kepada Masyarakat MES: Journal of Mathematics Education and Science Jurnal Penelitian Pembelajaran Matematika Sekolah Jurnal Eduscience (JES) Dedikasi: Jurnal Pengabdian Masyarakat Jurnal Pengabdian Masyarakat Borneo Jurnal Absis : Jurnal Pendidikan Matematika dan Matematika J-PiMat : Jurnal Pendidikan Matematika Jurnal Magister Pendidikan Matematika (JUMADIKA) Jurnal Abdi Insani Abdimasku : Jurnal Pengabdian Masyarakat Journal of Innovation Information Technology and Application (JINITA) Range : Jurnal Pendidikan Matematika Jubindo: Jurnal Ilmu Pendidikan Bahasa dan Sastra Indonesia Jurnal Anugerah: Jurnal Pengabdian Kepada Masyarakat Bidang Keguruan dan Ilmu Pendidikan Journal of Research in Mathematics Trends and Technology JAMBURA JOURNAL OF PROBABILITY AND STATISTICS JUPIKA: JURNAL PENDIDIKAN MATEMATIKA Jurnal Diferensial Jurnal Penelitian Inovatif MATH-EDU: Jurnal Ilmu Pendidikan Matematika Jurnal Algoritma Smart Society: Community Service and Empowerment Journal Fraction: Jurnal Teori dan Terapan Matematika Jurnal Pengabdian Sains dan Humaniora Malcom: Indonesian Journal of Machine Learning and Computer Science IC Tech: Majalah Ilmiah Parameter: Jurnal Matematika, Statistika dan Terapannya Kreativasi: Journal of Community Empowerment PADIMAS: Jurnal Pengabdian Masyarakat Journal of Mathematics, Computation and Statistics (JMATHCOS) Jurnal Jendela Matematika Jurnal Pendidikan MIPA Journal on Mathematics Education Trigonometri : Jurnal Matematika IC Tech: Majalah Ilmiah Media Pendidikan Matematika Babakti: Journal of Community Engangement
Simarmata, Justin Eduardo
Pendidikan Matematika, Fakultas Keguruan Dan Ilmu Pendidikan, Universitas Timor, Indonesia
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PENGEMBANGAN MEDIA PEMBELAJARAN BERBASIS GEOGEBRA UNTUK MENINGKATKAN KEMAMPUAN MENGKONSTRUKSI BUKTI MATERI LIMIT FUNGSI Ferdinandus Mone; Justin Eduardo Simarmata; Selestina Nahak
AKSIOMA: Jurnal Program Studi Pendidikan Matematika Vol. 14 No. 1 (2025)
Publisher : UNIVERSITAS MUHAMMADIYAH METRO

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/ajpm.v14i1.10990

Abstract

Definisi limit fungsi menggunakan  dan  yang bersifat abstrak sangat sulit dipahami oleh mahasiswa yang baru pertama kali berusaha untuk memahaminya. Definisi ini dipakai dalam pembuktian limit untuk menghilangkan bias subjektifitas dari definisi limit secara intuitif. Kesulitan memahami konsep yang tepat mengenai limit berdampak pada rendahnya kemampuan mahasiswa mengkonstruksi bukti. Penelitian ini bertujuan untuk mengembangkan media pembelajaran berbasis GeoGebra pada materi limit fungsi yang memenuhi kriteria valid, praktis, dan efektif dalam meningkatkan kemampuan mahasiswa dalam menyusun pembuktian. Jenis penelitian yang digunakan adalah Research & Development (R&D) dengan menerapkan model pengembangan ADDIE, yang terdiri dari tahap Analisis, Desain, Pengembangan, Implementasi, dan Evaluasi.  Penelitian ini dilaksanakan pada semester genap tahun akademik 2023-2024 dengan partisipan mahasiswa program studi Pendidikan Matematika Universitas Timor yang mengikuti mata kuliah Kalkulus. Instrumen yang digunakan dalam penelitian ini meliputi lembar validasi ahli, angket respons mahasiswa, serta tes untuk mengukur kemampuan mahasiswa dalam menyusun pembuktian pada materi limit fungsi.  Hasil penelitian menunjukkan bahwa media pembelajaran yang dikembangkan telah terbukti valid, praktis, dan efektif dalam meningkatkan keterampilan mahasiswa dalam mengonstruksi bukti pada materi limit fungsi. Media pembelajaran berbasis GeoGebra ini siap untuk diterapkan dalam proses pembelajaran Kalkulus dan Analisis Real.
The Correlation between the Utilization of M3 Board Learning Media and Students’ Learning Outcomes Maria Gaudensia Luruk; Justin Eduardo Simarmata; Kondradus Yohanes Klau
MATH-EDU: Jurnal Ilmu Pendidikan Matematika Vol. 10 No. 3 (2025): MATH-EDU: Jurnal Ilmu Pendidikan Matematika
Publisher : Program Studi Pendidikan Matematika, Fakultas Ilmu Pendidikan, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jipm.v10i3.9043

Abstract

This study aims to determine the correlation between the utilization of M3 board learning media and students’ learning outcomes on the topic of measures of central tendency. This research employed a quantitative approach with a correlational design using the Pearson Product Moment method. The population consisted of two eighth-grade classes with a total of 34 students at SMP Swasta 17 Agustus Webalu, while the sample was class VIII A consisting of 15 students. Data were collected through a questionnaire to measure the utilization of M3 board learning media and a test to assess students’ learning outcomes. The validity test results showed that all 12 questionnaire items were valid, with  , and the reliability test yielded a Cronbach’s Alpha value of 0.776 (> 0.6), indicating that the instrument was reliable. The normality test indicated a significance value of 0.248 (> 0.05), confirming that the data were normally distributed. Pearson correlation analysis revealed a correlation coefficient of 0.2646, categorized as low, and 0.8591, categorized as very strong, indicating a positive correlation between the utilization of M3 board learning media and students’ learning outcomes.      
The Effect of Providing Non-Cognitive Diagnostic Assessments and Realistic Mathematics Learning Approaches to Improve Students' Mathematical Literacy Skills Winda Maria Erwinda Kefi; Cecilia Novianti Salsinha; Justin Eduardo Simarmata
MATH-EDU: Jurnal Ilmu Pendidikan Matematika Vol. 10 No. 3 (2025): MATH-EDU: Jurnal Ilmu Pendidikan Matematika
Publisher : Program Studi Pendidikan Matematika, Fakultas Ilmu Pendidikan, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jipm.v10i3.10544

Abstract

This study aims to determine the effect of providing non-cognitive diagnostic assessments and Realistic Mathematics Education (RME) on improving students' mathematical literacy skills. This study applies a quasi-experimental method with a 2x2 factorial-based research design. Grade VIII students at Naiola State Junior High School were the population and sample in this study. The results of this study show that (1) there are differences in mathematical literacy skills between students who are given non-cognitive diagnostic assessments (students with very high, adequate, low and very low interest in learning); (2) there is a difference in students' mathematical literacy skills between students who are taught conventionally); (3) there is significant interactivity between non-cognitive diagnostic assessments and learning approaches to students' mathematical literacy skills. Thus, non-cognitive diagnostic assessments combined with realistic mathematical learning approaches have an effect on improving students' mathematical literacy skills compared to other treatments.
The Relationship Between Mathematics Anxiety and Problem-Solving Skills among Junior High School Students in Indonesia Rissa Isabella Taruli Marpaung; Justin Eduardo Simarmata
MATH-EDU: Jurnal Ilmu Pendidikan Matematika Vol. 11 No. 1 (2026): MATH-EDU: Jurnal Ilmu Pendidikan Matematika
Publisher : Program Studi Pendidikan Matematika, Fakultas Ilmu Pendidikan, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jipm.v11i1.10721

Abstract

Mathematics anxiety is a well-documented affective factor that negatively impacts students’ performance and engagement in mathematics. This study explores the relationship between mathematics anxiety and problem-solving skills among junior high school students in Indonesia. A total of 35 students from Grades 7 and 8 at SMP Sangkara in Medan participated. Mathematics anxiety was measured using a 20-item Likert scale (lower scores indicate higher anxiety), while problem-solving ability was assessed through a five-question open-ended test scored on a 4-point rubric. Descriptive statistics indicated moderate to high mathematics anxiety (M = 33.31, SD = 6.59) and low to moderate problem-solving ability (M = 8.06, SD = 4.33). Pearson correlation analysis revealed a strong, statistically significant positive relationship (r = 0.774, p < 0.001), showing that higher anxiety corresponded to lower problem-solving performance due to the reverse-coded anxiety scale. These findings underscore the importance of addressing affective challenges in mathematics instruction to enhance students’ problem-solving competence.
PEMBERDAYAAN MASYARAKAT LOKAL DALAM PEMBUATAN VIRGIN COCONUT OIL DENGAN TEKNOLOGI ALAT PARUT DAN PERAS SEDERHANA UNTUK MENGOPTIMALKAN PEREKONOMIAN Justin Eduardo Simarmata; Melkisedik Bukifan; Leonard Peter Gelu; Debora Chrisinta; Ni Wayan Sukerti; Nia Erlina; Ida Bagus Putu Mardana
JMM (Jurnal Masyarakat Mandiri) Vol 9, No 1 (2025): Februari
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v9i1.28127

Abstract

Abstrak: Desa Nian memiliki potensi kelapa yang melimpah, tetapi masyarakat hanya menjualnya dalam bentuk mentah dengan nilai ekonomi rendah. Kelompok Tani Oemanas, dengan 29 anggota, mengalami keterbatasan alat dan teknologi untuk mengolah kelapa menjadi Virgin Coconut Oil (VCO). Program pengabdian bertujuan meningkatkan kapasitas pengolahan kelapa melalui penerapan teknologi sederhana dan pelatihan, dengan fokus pada pengembangan hardskill, seperti penguasaan proses teknis dan penggunaan alat, serta softskill, seperti komunikasi, kerja sama tim, dan manajemen waktu, untuk mendukung keberlanjutan dan efektivitas hasil pengolahan. Metode kegiatan meliputi sosialisasi, workshop, pelatihan teknis, penerapan alat modern seperti mesin parut otomatis dan alat pemeras santan, serta pendampingan dan evaluasi. Evaluasi dilakukan melalui observasi, angket sebanyak 12 pernyataan, dan wawancara. Hasil menunjukkan peningkatan kapasitas produksi hingga 60 botol (100 ml) per minggu, efisiensi waktu produksi meningkat 30%, dan kualitas VCO sesuai standar industri. Sebanyak 85% peserta mampu mengoperasikan alat, dan 80% melaporkan peningkatan pendapatan dari penjualan VCO. Program ini meningkatkan soft skill dan hard skill anggota, tetapi juga mengoptimalkan potensi lokal dan mendukung pencapaian SDGs pada tujuan pekerjaan layak dan pertumbuhan ekonomi.Abstract: Nian Village possesses abundant coconut resources, yet the community predominantly sells them in raw form with low economic value. The Oemanas Farmers Group, comprising 29 members, faces limitations in equipment and technology for processing coconuts into Virgin Coconut Oil (VCO). The community service program aims to enhance the capacity for coconut processing through the application of simple technology and training, with a focus on developing hard skills, such as mastering technical processes and tool usage, as well as soft skills, such as communication, teamwork, and time management, to support the sustainability and effectiveness of the processing outcomes. The methods included socialization, workshops, technical training, implementation of modern tools such as automatic graters and coconut milk presses, as well as mentoring and evaluation. Evaluations were conducted through observation, surveys, and interviews. The results indicated an increase in production capacity to 60 bottles (100 ml) per week, a 30% improvement in production efficiency, and VCO quality that meets industry standards. Additionally, 85% of participants successfully operated the equipment, and 80% reported increased income from VCO sales. This program improved members' soft and hard skills but also optimized local potential and supported SDG goals for decent work and economic growth. 
PENERAPAN TEKNOLOGI OLAHAN MAKANAN BERBAHAN IKAN LAUT DAN DAUN KELOR SEBAGAI UPAYA PENINGKATAN EKONOMI DAN PENCEGAHAN STUNTING Debora Chrisinta; Justin Eduardo Simarmata; Ludgardis Ledheng; Leonard Peter Gelu; Ni Wayan Sukerti; Made Santo Gitakarma; Ida Bagus Putu Mardana
JMM (Jurnal Masyarakat Mandiri) Vol 10, No 1 (2026): Februari
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jmm.v10i1.36180

Abstract

Abstrak: Program Kosabangsa di Desa Oepuah Selatan, Kabupaten Timor Tengah Utara, dilaksanakan sebagai upaya mengatasi rendahnya produktivitas usaha rumah tangga dan tingginya prevalensi stunting yang dipengaruhi oleh keterbatasan akses pangan bergizi dan pengelolaan usaha berbasis teknologi. Program ini bertujuan untuk meningkatkan kapasitas produksi, manajemen, dan pemasaran kelompok industri rumah tangga berbasis ikan, serta memperkuat peran Posyandu dalam pengelolaan pangan lokal bergizi dan digitalisasi layanan gizi balita. Metode pelaksanaan meliputi sosialisasi, pelatihan, workshop, pendampingan, dan penerapan teknologi tepat guna yang dilaksanakan secara partisipatif. Peserta kegiatan terdiri atas Kelompok Industri Rumah Tangga Nekmese sebanyak 27 orang dan kader Posyandu Desa Oepuah Selatan sebanyak 20 orang. Evaluasi program dilakukan melalui observasi langsung, angket kepuasan mitra, dan analisis capaian indikator kinerja program. Hasil kegiatan menunjukkan adanya peningkatan keterampilan teknis dan manajerial mitra industri sebesar 40% pada aspek produksi dan pengemasan, serta peningkatan penjualan produk olahan ikan sebesar 30%. Pada mitra Posyandu, sebanyak 80% kader mampu mengoperasikan sistem pencatatan gizi berbasis digital secara mandiri, disertai peningkatan kesadaran gizi masyarakat. Program ini berkontribusi dalam meningkatkan nilai ekonomi produk lokal, memperkuat kapasitas layanan gizi masyarakat desa, serta menjadi model kolaborasi pemberdayaan berbasis teknologi dan potensi lokal yang berkelanjutan.Abstract: The Kosabangsa Program in Oepuah Selatan Village, North Central Timor Regency, was implemented to address low household business productivity and high stunting prevalence resulting from limited access to nutritious food and inadequate technology-based enterprise management. This program aimed to enhance production capacity, managerial competence, and marketing of fish-based home industries, as well as to strengthen the role of Posyandu in managing nutritious local food and digitalizing child nutrition services. The implementation methods included socialization, training, workshops, mentoring, and the application of appropriate technology through a participatory approach. The program participants consisted of 27 members of the Nekmese Home Industry Group and 20 cadres of the Oepuah Selatan Posyandu. Program evaluation was conducted through direct observation, partner satisfaction surveys, and performance indicator analysis. The results demonstrated a 40% increase in technical and managerial competencies related to production and packaging, along with a 30% increase in sales of processed fish products. Among Posyandu partners, 80% of cadres were able to independently operate digital nutrition recording systems, accompanied by increased community nutrition awareness. This program contributes to enhancing the economic value of local products, strengthening community-based nutrition services, and providing a sustainable model of technology-driven and locally grounded empowerment.
Enhancing Students' Learning Activities and Learning Outcomes in Relations and Functions Through the Numbered Heads Together (NHT) Learning Model Fransiska Rina Nahak; Justin Eduardo Simarmata; Selestina Nahak
MATH-EDU: Jurnal Ilmu Pendidikan Matematika Vol. 11 No. 2 (2026): MATH-EDU: Jurnal Ilmu Pendidikan Matematika
Publisher : Program Studi Pendidikan Matematika, Fakultas Ilmu Pendidikan, Universitas Timor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32938/jipm.v11i2.11216

Abstract

 This study aimed to improve students’ learning activities and learning outcomes through the implementation of the Numbered Heads Together (NHT) cooperative learning model. The study employed Classroom Action Research (CAR) based on Kurt Lewin’s model, consisting of four stages: planning, acting, observing, and reflecting. The research was conducted during the first semester of the 2025/2026 academic year and involved 25 students of Class VIII-B. Data were collected through classroom observation sheets to assess students’ learning activities and achievement tests to measure learning outcomes. The success indicators were determined based on the achievement of the predetermined criteria for students’ learning activities and learning outcomes. The results showed that students’ learning activities increased from 62.14% in Cycle I to 84.28% in Cycle II, while the mean learning outcome score increased from 72.84 in Cycle I to 82.48 in Cycle II. These improvements across cycles indicate that the implementation of the NHT cooperative learning model improved students’ learning activities and learning outcomes in mathematics. Therefore, the NHT learning model can be used as an alternative instructional approach to promote active and collaborative learning in teaching Relations and Functions.
Estimasi Parameter Regresi Linier Sederhana Menggunakan Prosedur Cochrane-Orcutt, Hildreth-Lu dan First Differences Pada Metode Durbin Watson Switamy Angnitha Purba; Debora Chrisinta; Justin Eduardo Simarmata
Journal of Mathematics, Computations and Statistics Vol. 6 No. 2 (2023): Volume 06 Nomor 02 (Oktober 2023)
Publisher : Jurusan Matematika FMIPA UNM

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to examine the problem of autocorrelation, simple regression analysis with errorsfollowing the form of first-order autoregressive, Durbin Watson method using the Cochrane-Orcutt,Hildreth-Lu procedures and first differences in overcoming autocorrelation. The occurrence ofautocorrelation causes the alleged regression parameter with ordinary least square (OLS) not to producethe actual value. Therefore, to obtain the actual parameters applied Durbin watson method with all threeprocedures. Based on the data used in this thesis quoted from the book Applied Linear Statistical ModelsFifth Edition, the best procedure is given by Hildreth-Lu because it produces the smallest mean squareerror (MSE) value namely 0,204. This is because, the process of estimating the autocorrelation coefficientis based on iterations until a minimum sum square error (SSE) value is found.
Co-Authors Abi, Roberto Ade Mirza Adelya I Manalu admin pythagoras, admin Agnes L A Halla Agustinus Giovandi Laki Agustinus Giovandi Laki Ahzan, Z.N. Ahzan, Zulkaidah Nur Alejandro Jr. V. Matute Aloisius Loka Son Astriani Dewi, Ni Putu Yuni Atencia, Bryant Bennet D Atencia, Bryant Bennet D. Baldemor, Milagros R. Bana, Marten Luter Bano, Elinora Naikteas Bantaika, Aris Benu, Kristiani Benu, Luky Wandika Bernadeta Buik Bete, Hendrika Bete, Maria Erlince Bifel, Maria Gabriela Bait Bone, Dominifridus Cecilia Novianti Salsinha Chrisinta, Debora Debora Chrisinta Debora Chrisinta Debora Exaudi Sirait Dian Grace Ludji Elfrida Nailopo Elin, Lailin Hijriani Elisabet Ersamayori Foeh Elisabeth E Mayori Elizio Victor De Araujo Eva Binsasi Fallo, Kristoforus Ferdinan Rinaldo Tampubolon Ferdinandus Mone Fetronela Rambu Bobu Fitriani Fitriani Fitriani Fransiska Rina Nahak Gelu, Leonard Peter Gelu, Leonard Peter Gerhard-Wilhelm Weber Gusti Firda Khairunnisa H. Bete Hendrika Yeni Meti Hijriani, Lailin Hijriani, Lailin Hutubessy, Aditya Ida Bagus Putu Mardana Ida Bagus Putu Mardana Ida Bagus Putu Mardana Iis Aprianti Iis Aprianti Jaya Santoso Jeniana Martha Prima Asa Josua Sahala Juventianus Kenjam Juventianus Kenjam Kehi, Sefrinus Kenjam, Juventianus Klau, Kondradus Yohanes Kondradus Yohanes Klau Kono, Metriana Maria Kristofel Bere Nahak Kristoforus Fallo Lailin Hijriani Leonard Peter Gelu Lidu, Maria Ludgardis Ledheng Made Santo Gitakarma Maneno, Regolinda Margareta Rodrigues Gomes Margarita Tampani Maria Brigita Niis Nana Maria Delviana Mali Maria Gaudensia Luruk Maria Naimnule Marselinus Banu Melkisedik Bukifan Melkisedik Bukifan Merlin Helentina Napitupulu Miko Purnomo Miko Purnomo mone, ferdinandus Moses Timutang Muhammad Amran Shidik Naimnule, Maria Naisau, Angela Cristina Natalia Emanuela Lelboy Nelciana Talan Nelciana Talan Ni Putu Yuni Astriani Dewi Ni Putu Yuni Astriani Dewi Ni Wayan Sukerti Ni Wayan Sukerti Ni Wayan Sukerti Nia Erlina Nia Erlina Nifu, Martha Marsela Nifu, Martha Marsella Oktovianus Mamoh Olo, Maria Regina Pakaenoni, Lusilia Dos Santos Pasaribu, Revi Lestari Patrisius Bauk Peter Gelu, Leonard Pius Thaal, Pius Prudensius Manek Rissa Isabella Taruli Marpaung Rita Sila, Vinsensia Ulia Roberto Abi S. A. Purba Sanam, Thofilus Sari, Nur Nilam Seko, Herbert Sele, Yunawati Selestina Nahak Siahaan, Meiva Marthaulina Lestari Sila, Vinsensia Ulia Rita Silfester Faentaono Sirait, Debora Sitti Rosnafi’an Sumardi Sopbaba, Merlina Stanislaus Amsikan Switamy Angnitha Purba Switamy Angnitha Purba Switamy Angnitha Purba Taena, Vinsensia Gerosa Tavares, Ricson Thresia Trivict Semiun Usifa, Inggrid Mariana Uskono, Yunitha Centriana Venidora Solo, Maria Fransiska Vinsensia Ulia Rita Sila Wihelmina, Maria Wisrance Winda Ade Fitriya B Winda Maria Erwinda Kefi Wua Laja, Yosepha Patricia Yakoba Yusina Muanley Yeni Missa Yohanes Jefrianus Kehi Zulkaidah Nur Ahzan Zulkaidah Nur Azhan