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The Ethnomathematics of the Orem Sasadu Sahu Tribe: Reconstructing Mathematical Concepts from Cultural Activities Suharna, Hery; Hi Abdullah, In; Supratman, Supratman; Rasid Saputra, Lamanisa
IJORER : International Journal of Recent Educational Research Vol. 7 No. 2 (2026): March
Publisher : Faculty of Teacher Training and Education Muhammadiyah University of Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46245/ijorer.v7i2.1071

Abstract

Objective: This research examines the process of constructing mathematical concepts, which is very interesting and important. The principles of mathematical constructivism are closely linked to information processing theory in constructing concepts and reconstructing new information. This research aims to determine how mathematical reconstruction occurs in a theoretical and practical study of the fundamental activities of the Orem Sasadu Sahu Tribe on Halmahera Island. Method: This research is a qualitative research with an ethnographic approach. The data analysis used is the methodical elements, namely description, interpretation, historical continuity, and heuristic. Furthermore, data acquisition is by field study methods, exploration, observation, interviews and documentation. In this study, the focus is on fundamental activities (1) determining time, (2) calculation, (3) counting, and (4) measuring. The data analysis technique used is a qualitative data analysis technique. Results: This research obtained the results that (1) The construction of mathematical thinking is the activity of measuring to determine the amount of wood needed which is connected to the concept of geometry. (2) The construction of mathematical thinking is the activity of calculating and measuring to determine the amount of wood needed which is connected to the concept of natural number operations patterned like rows and series in mathematics; (3) The construction of mathematical thinking is the activity of determining how long the material must be cut, how long the renovation must take and the length of time. Novelty: The study of mathematical thinking constructs in Orem Sasadu activities is unique and interesting to examine. These constructs yielded three findings: measuring, calculating, and determining time.
Dinamika Spasial dan Kesehatan Ekologis Ekosistem Mangrove: Perspektif dari Lantebung, Makassar, Indonesia Sabar, Adrayanti; Nursaputra, Munajat; Jusuf, Yusran; Supratman, Supratman; Makassau, Ahmad Rifqi; Basri, Nurul Muchlisah; Nurjanna, Nurjanna; Araya, Ahmad
Jurnal Ilmu Kehutanan Vol 20 No 1 (2026): March
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jik.v20i1.20360

Abstract

The mangrove ecosystem is crucial for coastal protection, carbon sequestration, and biodiversity conservation. Therefore, this research aimed to investigate the spatial dynamics and health of the Lantebung Mangrove Ecosystem in Bira Village, Makassar from 2017 to 2023, using the Mangrove Health Index (MHI) derived from satellite imagery to assess changes in mangrove area, evaluate health using Normalized Burn Ratio (NBR), Green Chlorophyll Index (GCI), Structure Insensitive Pigment Index (SIPI), and Atmospherically Resistant Vegetation Index (ARVI) indices, and identify influencing factors, including urbanization, pollution, and conservation efforts. The analysis used Landsat 8 imagery to calculate MHI values and classify health levels. The results showed an increase in mangrove area from 14.45 ha in 2017 to 18.19 ha in 2023, attributed to effective conservation programs. However, MHI values fluctuated, peaking at 370.32 in 2020 and declining to 148.60 in 2023, indicating persistent environmental pressures. This research underscored the need for integrated management practices to enhance mangrove health and resilience against urbanization, pollution, and climate change. The results underscored the importance of remote sensing for monitoring and guiding conservation strategies in the mangrove ecosystem.
PENGEMBANGAN LEMBAR KERJA PESERTA DIDIK (LKPD) BERBASIS PBL UNTUK MENGEKSPLOR KEMAMPUAN BERPIKIR KRITIS MATEMATIS PESERTA DIDIK Nopiana, Rida; Supratman, Supratman; Rahayu, Diar Veni
EDU-MAT: Jurnal Pendidikan Matematika Vol 14, No 1 (2026)
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/edumat.v14i1.23278

Abstract

Penelitian ini bertujuan untuk menghasilkan produk Lembar Kerja Peserta Didik (LKPD) berbasis PBL untuk mengeksplor kemampuan berpikir kritis matematis peserta didik pada materi penerapan konsep perbandingan trigonometri. Jenis penelitian ini adalah R&D dengan model pengembangan 4D yaitu tahap define, design, development dan dissemination. Validasi produk yang dikembangkan melibatkan ahli materi dan ahli media. Hasil uji validasi yang diberikan kepada para ahli materi dan ahli media berada pada kategori “sangat valid”. Uji kelayakan produk melibatkan guru matematika dan peserta didik dan memperoleh kategori “sangat positif”. Uji keefektifan menggunakan effect size (d) dengan nilai 1,76 sangat efektif untuk mengeksplor kemampuan berpikir kritis matematis. Penelitian ini dilakukan di MAN 5 Tasikmalaya yang melibatkan 18 peserta didik sebagai subjek uji coba dengan objek penelitiannya berupa LKPD berbasis PBL untuk mengeksplor kemampuan berpikir kritis matematis peserta didik. Penelitian ini menghasilkan produk LKPD berbasis PBL yang valid dan efektif untuk mengeksplor kemampuan berpikir kritis matematis peserta didik.   Kata kunci: LKPD, PBL, Kemampuan Berpikir Kritis Matematis Abstract: This research aims to produce a PBL-based Student Worksheet product to explore students' mathematical critical thinking skills in the application of trigonometric comparative concepts. This type of research is R&D with a 4D development model which is the define , design, development and dissemination stages. The validation of the developed product involves subject matter experts and media experts. The results of the validation test given to material experts and media experts are in the "very valid" category. The product feasibility test involved math teachers and students and obtained the "very positive" category. The effectiveness test using effect size (d) with a value of 1.76 is very effective to explore mathematical critical thinking skills. This research was conducted at MAN 5 Tasikmalaya involving 18 students as trial subjects with the object of research in the form of PBL-based student worksheet to explore students' mathematical critical thinking skills. This study produced valid and effective PBL-based student worksheet products to improve students' mathematical critical thinking skills. Keywords: Student worksheet, PBL, Mathematical Critical Thinking Skills
Co-Authors Abdillah, Vitta Oktavina Abiyuna, Thaufan Ade Safitri, Ade Agus Salim Agussalim, Agussalim Akhmad Akhmad Alfatia, Alfatia Alhafizin, M. Ali, Nabila Nurhaliza Alwintara, Dhuma Aza Ambiyar, Ambiyar Andi Detti Yunianti Andini, Femila Nur Aorazizah, Noviyana Cindy Apriani, Yuli Arafat, Andi Araya, Ahmad Arif Rahman Hakim Ariski, M. Fikri Armansyah Putra, Armansyah Arrahman, Rudi Arsonariya, Arsonariya Aryani, Menik Asmawati, Ainun Astuti Arif Astuti, Vina AYU LESTARI Azwar, Azwar Banuapta, Habib Khosi Abrorri Basri, Nurul Muchlisah Belinda, Dinda Bidaya, Jaini Cahayani, Kartika Chasanah, Afrida Nur Cici Aulia Permata Bunda, Cici Aulia Permata Darmawan Salman Dassir, Muh Dedi Muhtadi, Dedi Deti, Deti Sri Rahayu Dewi ANGGRAENI Dewi, Sinta Verawati Diniarti, Eti Diyanto, Velani Prastika Erwanindyasari, Risma Nuril Erwin Erwin Erwin Erwin Fadhya, Fadhya Faqihuddin Faqihuddin Fatiha, Annisa Nur Feni Mustika Sari Firdaus, Naufal Fitri, Muzizah Fitriatun, Yuyun Frangky Silitonga Galih Mulya Subastyan Gara, Sori Mariati Gusmiaty Gusmiaty, Gusmiaty Habiburrahman Habiburrahman, Habiburrahman Hafidzah, Putri Halimah Larekeng, Siti Hardi, Rahmat Sulhan Haridah, Fatma Harisa, Rahmawati Harmini, Harmini Harweli, Dafri Hasibuan, Muktar Isnan Hasyim, Husain Hayatunnisah, Hayatunnisah Hery Suharna Hetty Patmawati Hi Abdullah, In Hidayanti, Nur Huda, Dwiyanti Nurul Ieke Wulan Ayu Ilham Ilham ILHAMALIMY , RIDHO RAFQI IRA TASKIRAWATI Iskandar Iskandar Ismaira, Wilda Iswanto Iswanto Jatnika, Muhammad Dzulfaqori Jusuf, Yusran Kamila, Zalfa Kartadi, Danish Krisnahadi, Tama L. Tobing, Vargo Christian Laksmi, Ajeng Triani Larasati, Aulya Putri Lesmana, Belda Nurmultiefa Lestari, Fany Lindra Linda Herawati, Linda Lugi, Fitriana M. Nawir, M. M. Yogi Riyantama Isjoni Maiyana, Efmi Makassau, Ahmad Rifqi Makkarennu, Makkarennu Mansyur Mansyur Mansyur, Muhamad Zulfikar Masdiana Masdiana Maulina, Nurul Mauliza, Mauliza Mega Nur Prabawati, Mega Nur Mellisa Towadi Muhammad Akhmar, Andi Muhammad Hafizin Muhammad Harun Mujetahid, Andi Munajat Nursaputra, Munajat Mus, Akhmad H. Muslimin Muslimin Mustaqimah, Utami Puspita Sabilla Nabila, Putri Nani Ratnaningsih Nila Sari Nimah, Khomsatun Niswariyana, Ahyati Kurniamala Nopiana, Rida Noviati, wiwi Nugraha, Didik Syam Nugroho, Muhammad Rafly Nur Azizah, Fatmawati Nur Ilman, Muhammad Agil Nur Mohamad Kasim Nurhayati, Elis Nurjamil, Dedi Nurjamil Nurjanna Nurjanna Nurmala Nurmala Nurmiwati, Nurmiwati Nursyahidah, Silmi Nurtasyha, Nurtasyha Oktafiani, Astri Oktriani, Tantri Pangestu, Kidung Tirtayasa Putra Pebrian, Syahid Prastiyo, Andi Pratama, Andi Gunawan Pratiwi, Alifka PUJI LESTARI Pyo Munawarah Rahayu, Diar Veni Rahayu, Diar Veny Rahman, Fathu Rahmandari, Ismi Arifiana Ramadhani, Nur Lailli Ramdhayani, Eryuni Ramna, Siti Rasid Saputra, Lamanisa Ratna Rustina Restinavia, Nyimas Arsilla Ridho Rafqi Ilhamalimy Rifky Makkasau, Ahmad Rismi, Dede Rizky, Rizky Mauldan Muhammad Yusuf Rosanery, Viony Ersantyas Rosmiati, Ucu Rusadi, Nusrah Rusdianto Rusdianto, Rusdianto S, Harlina Sabar, Adrayanti Saddam Saddam, Saddam Saharuddin Sahriyanti Saad Sami’un, Sami’un Saputri, Nadia Saputri, Sindika Aprilia Satriawansyah, Tri Saul, Sariva Sayuti, Lalu Septika, Baiq Herdina Sila, Sri Arfiani Rahim Sirad, La Ode Sirad Sirma Sirma Siti Hadijah Siti Lamusiah, Siti SITI MARYAM Sitti Nuraeni Solikhah, Nabila Putri Nur Sri Nurhidayati, Sri Sri Tirto Madawistama Sri Wahyuni, Dian Eka Mayasari Suhada, Ikhlas Suhasman, Suhasman SUHIRMAN SUHIRMAN Sulistiyowati, Nopi Sulystyaningsih, Naning Dwi Sumarsih, Enok Supriono, Ajeng Ayu Syafria, Syafria Syaharani, Danisa Bella Syahidah, Syahidah SYAMSU ALAM Syamsu Rijal Syamzan Syukur Syarif Fitriyanto Tajuddin Tajuddin, Tajuddin Tirtayasa Putra Pangestu, Kidung Ubaidullah Ubaidullah, Ubaidullah Ula, Khayranil Ulfah, Elia Damayantie Uljanatunnisa, Uljanatunnisa Usammah, Usammah Uswatun Hasanah Utami, Yuni Wulan Vasliana, Dedek Veithzal Rivai Zainal Vinami Yulian Wardani, Wening Kusuma Wardhana, Muhammad Masardi Wetria, Wetria Wibowo, Agung Edy Widyawati, Sekar Ayu Wijayanti, Andi Ridha Yayank Wulandari, Yayang Erry Yaldi, Yusri YULIA, Meri Yulianah, Lia Yusran Yusran Yusril Ihza Mahendra Yustisiawan, Muhammad Zakir, Agus Salim Zamzam, Nur