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All Journal Jurnal Riset Pendidikan Matematika AKSIOMA: Jurnal Program Studi Pendidikan Matematika Jurnal Elemen EDU-MAT: Jurnal Pendidikan Matematika Indonesian Journal of Science and Mathematics Education Numeracy : Jurnal Ilmiah Pendidikan Matematika Jurnal Saintek Lahan Kering Martabe : Jurnal Pengabdian Kepada Masyarakat JURNAL MathEdu (Mathematic Education Journal) MES: Journal of Mathematics Education and Science Asimtot : Jurnal Kependidikan Matematika Range : Jurnal Pendidikan Matematika MATH-EDU: Jurnal Ilmu Pendidikan Matematika Jurnal Pengabdian Sains dan Humaniora Prosiding Konferensi Nasional Penelitian Matematika dan Pembelajarannya Jurnal Pendidikan dan Pengabdian Masyarakat AMMA : Jurnal Pengabdian Masyarakat Indonesian Educational Research Journal
Selestina Nahak
Universitas Timor
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Decision Sciences, Operations Research & Management Education Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Nursing Public Health Social Sciences Other

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Students' Ability to Understand Concepts in Solving Problems of Similarity and Congruence Seko, Herbert; Nahak, Selestina; Simarmata, Justin Eduardo; Atencia, Bryant Bennet D
MATH-EDU: Jurnal Ilmu Pendidikan Matematika Vol. 10 No. 1 (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.v10i1.7327

Abstract

This study employs a qualitative descriptive approach aimed at evaluating students' conceptual understanding in solving similarity and congruence problems at SMP Negeri Oelneke. The subjects of the study were ninth-grade students. The results of the conceptual understanding test show that 29.4% of the students fall into the low ability category, 41.1% into the moderate ability category, and 29.4% into the high ability category. These results indicate that the majority of students at SMP Negeri Oelneke demonstrate a moderate level of conceptual understanding. The students face difficulties in solving the problems due to a lack of understanding of the given problems, which prevents them from providing optimal responses.
Photomath application for learning algebra: Preliminary study on a school in border area Siahaan, Meiva Marthaulina Lestari; Salsinha, Cecilia Novianti; Hijriani, Lailin; Nahak, Selestina; Daniel, Farida
Indonesian Journal of Science and Mathematics Education Vol. 8 No. 1 (2025): Indonesian Journal of Science and Mathematics Education
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/ijsme.v8i1.24297

Abstract

This research was motivated by the shift in the educational paradigm toward technology-integrated learning and addresses the disparity in facilities between urban and border area schools. It aimed to determine the effect of Photomath on students' cognitive abilities and to assess their attitudes, motivation, belief, and readiness towards its use in a border area school. The instruments employed were pretest, posttest, and questionnaire. This research serves as an initial study on the use of technology in schools located in border areas. A mixed-method approach was employed, combining qualitative and quantitative analyses. The qualitative analysis of student responses was facilitated by Photomath, while the quantitative method followed a pre-experimental one-group pretest-posttest design. The findings showed a 36.25% improvement in algebra test scores. Students’ learning motivation reached 82.97% (very strong), belief in Photomath was 88.13% (very strong), and readiness to use the Photomath was 78.97% (strong). After using Photomath, students understood each stage of solving algebra problems better, indicating that Photomath supported their learning process. The implication is that integrating Photomath in border-area schools provides valuable support for students, particularly in self-directed learning.
PELATIHAN IMPLEMENTASI KURIKULUM MERDEKA BAGI GURU-GURU MATEMATIKA DI KABUPATEN TIMOR TENGAH UTARA, PROVINSI NUSA TENGGARA TIMUR Novianti Salsinha, Cecilia; Enny Murwaningtyas, Chatarina; Andhy Rudhito, Marcellinus; Julie, Hongki; Stanislaus, Amsikan; Nahak, Selestina; Bete, Hendrika
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 7, No 1 (2024): MARTABE : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v7i1.204-214

Abstract

Peluncuran Kurikulum Merdeka di Indonesia telah menandai perubahan penting dalam sektor pendidikan, khususnya bagi para guru matematika di Kabupaten Timor Tengah Utara. Tantangan baru dan peluang untuk pengembangan profesional ini menuntut pemahaman yang lebih mendalam tentang kurikulum dan adaptasi metode pengajaran yang sesuai. Untuk mendukung transisi ini, sebuah program pelatihan khusus telah dirancang, bertujuan untuk memperdalam pemahaman guru tentang berbagai aspek Kurikulum Merdeka dan meningkatkan keterampilan praktis mereka dalam penerapannya. Melalui diskusi interaktif dan tugas-tugas kreatif, fokus pelatihan diberikan pada pengembangan Alur Tujuan Pembelajaran (ATP) dan modul pembelajaran yang inovatif, mendorong pendekatan pengajaran yang lebih efektif dan kreatif. Hasilnya, terlihat peningkatan signifikan dalam kemampuan guru untuk menerapkan strategi dan metode yang diajarkan, menciptakan lingkungan pembelajaran yang lebih dinamis dan menarik. Kemajuan ini tidak hanya memperkuat keterampilan pedagogis guru tetapi juga meningkatkan kualitas pengalaman belajar siswa, memberikan dampak positif pada pengajaran matematika secara umum.
Analysis of the Mathematical Reasoning Ability of High School Students in Solving Trigonometric Problems Hildegardis Kono Oemanas Oemanas; Selestina Nahak; Ferdinandus Mone; Camilo Andrés Rodríguez-Nieto
Indonesian Educational Research Journal Vol. 2 No. 2 (2024): Teaching and Learning at the Educational Unit Level.
Publisher : CV. Samuel Manurung and Co

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56773/ierj.v2i2.43

Abstract

Reasoning is needed by students to solve trigonometry problems that are considered difficult to solve. So, the researcher conducted a study to determine students' mathematical reasoning skills in solving trigonometric problems. This type of research is descriptive research with qualitative methods. The subjects of this study were 3 students of class XII in one of the senior high schools in North Central Timor district. Data collection techniques were test questions and interviews. From the results of the study, it was concluded that high category mathematical reasoning ability was able to fulfill 4 reasoning indicators, medium category mathematical reasoning ability was able to fulfill 2 reasoning indicators, while low category reasoning ability only fulfilled 1 reasoning ability indicator.
ETNOMATEMATIKA TENUN TRADISIONAL BUNA TIMOR TENGAH UTARA DAN IMPLIKASI PEDAGOGIS Selestina Nahak; Ivonia Ulu; Yohanes Jefrianus Kehi
JURNAL MathEdu (Mathematic Education Journal) Vol 9 No 1 (2026): JURNAL MathEdu (Mathematic Education Journal) Maret 2026
Publisher : Program Studi Pendidikan Matematika Institut Pendidikan Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37081/mathedu.v9i1.7804

Abstract

Abstract This study aims to reveal the mathematical concepts embedded in the weaving activities of Buna woven-cloth artisans in Letmafo Village, Central Insana District, North Central Timor Regency. This research employed a qualitative ethnographic approach. Data were collected through observation, interviews, and documentation with three main informants: a traditional leader and two experienced weavers. Data analysis used domain, taxonomy, componential, and cultural-theme stages. The findings show that weaving activities contain mathematical elements such as counting (the number of threads and repeated patterns), measuring (length and width of the cloth using non-standard units such as hand-span), and designing (forming geometric patterns such as squares, triangles, rhombuses, and lines of symmetry). Ethnomathematics in the Buna motif reflects an integration between local culture and mathematical concepts of geometry and number patterns that can be used as contextual learning resources. Keyword: Ethnomathematics, Buna woven cloth, Letmafo culture, mathematics learning
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.
Co-Authors admin pythagoras, admin Agustina Yohana Hoar Aloisius Loka Son Amanda Yuvensia Nitbani Amsikan Stanislaus Ana Paula Daconceicao Andhy Rudhito, Marcellinus Angelina I. Cunha Antonio P.S.A. Laka Atencia, Bryant Bennet D Bana, Imelda Jebrina Bete Sanan, Lidia Rosina Bete, Elviana Bete, Hendrika Camilo Andrés Rodríguez-Nieto Cecilia Novianti Salsinha Chatarina Enny Murwaningtyas Deda, Yohanis Ndapa Eva Binsasi Farida Daniel Ferdinandus Mone Fitriani Fitriani Flaviana M.V Taus Florensia Kolo Frowin Seran Hermina Disnawati, Hermina Hijriani, Lailin Hijriani, Lailin Hildegardis Kono Oemanas Oemanas Hongki Julie Imelda Loin Ivonia Ulu Julieta Martins Kenjam, Juventianus Kofi, Maria Dionesia Kolo, Elfrida Kou, Dominikus Marcellinus Andhy Rudhito Maria Eviana Telik Nahak Maria Lina Keban Maria Yenitriana Nono Maria Yovita Mali mone, ferdinandus Natalia Emanuela Lelboy Oktovianus Mamoh Oktovinus Mamoh Patrisia Timo Petra Nahak Petronella Laurina Talan Seko, Herbert Siahaan, Meiva Marthaulina Lestari Sidonia Esperansa Hoar Simarmata, Justin Eduardo Stanislaus Amsikan Stanislaus, Amsikan Stefania Banase Vergilia Taitoh Yohanes Jefrianus Kehi Yoseph Pius Kurniawan Kelen Yustinus Seran Yuvenalis Kewa Ama