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Tjang Daniel Chandra

Universitas Negeri Malang

Author-ID : 2388439

Religion Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Transportation Other

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BIMBINGAN INTENSIF/ PENGUATAN MATERI OSNP MATA PELAJARAN MATEMATIKA SISWA MAN 2 TULUNGAGUNG Solikhin, Mukhammad; Rahmadani, Desi; Sulandra, I Made; Chandra, Tjang Daniel
PEDAMAS (PENGABDIAN KEPADA MASYARAKAT) Vol. 3 No. 03 (2025): MEI 2025
Publisher : MEDIA INOVASI PENDIDIKAN DAN PUBLIKASI

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

Sejak tahun 2002 Pemerintah menyelenggarakan Olimpiade Sains Nasional (OSN) untuk jenjang SMA. Sedangkan OSN untuk jenjang SD dan SMP diadakan sejak 2003. Matematika merupakan salah satu mata pelajaran yang dilombakan. Berdasarkan panduan OSN (2018), OSN Matematika SMP bertujuan mengukur secara langsung tiga aspek pemecahan masalah, penalaran, dan komunikasi tertulis. Oleh karena itu persiapan calon peserta OSN semestinya berorientasi kepada peningkatan kemampuan dalam ketiga aspek tersebut. Melalui kegiatan OSN Matematika ini diharapkan terpilih siswa-siswa terbaik yang menguasai Matematika sebagai embrio untuk dipersiapkan menjadi calon peserta olimpiade tingkat internasional (International Mathematics Olympiad). Mekanisme pelaksanaan lomba dibagi dalam beberapa tahap yaitu seleksi tingkat kota, tingkat propinsi dan tingkat nasional. Siswa MAN 2 Tulungagung sering lolos olimpiade matematika tingkat kota (OSK) tetapi mereka tidak lolos pada tingkat provinsi. Oleh karena itu pihak MAN 2 Tulungagung mengadakan kerjasama dengan departemen matematika UM untuk memberikan bimbingan intensif materi OSP kepada siswa mereka. Tujuan bimbingan intensif ini untuk memperlengkapi siswa mereka dengan soal-soal OSP. Dengan demikian diharapkan siswa-siswa tersebut bisa lolos OSP tahun 2024

Reversible thinking in solving mathematics problems in terms of cognitive style Fauzan, Hakmi Rais; Hidayanto, Erry; Chandra, Tjang Daniel
Al-Jabar: Jurnal Pendidikan Matematika Vol 15 No 2 (2024): Al-Jabar: Jurnal Pendidikan Matematika
Publisher : Universitas Islam Raden Intan Lampung, INDONESIA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/ajpm.v15i2.24527

Background: Reversible thinking, the ability to think bidirectionally, is a crucial component of mathematical problem-solving. Differences in cognitive styles, particularly field-dependent and field-independent characteristics, play a significant role in students' reversible thinking, necessitating a deeper exploration of these relationships.Aim: This study aims to describe students' reversible thinking processes in solving mathematical problems based on their cognitive styles, focusing on field-dependent and field-independent traits.Method: A qualitative descriptive approach was applied to 32 eighth-grade students from a junior high school in Malang City, Indonesia. Data were collected using the Group Embedded Figures Test (GEFT), a reversible thinking test, and semi-structured interviews. Students were categorized into field-dependent and field-independent groups using GEFT before undertaking a reversible thinking test. Semi-structured interviews were conducted to gain deeper insights into their problem-solving approaches.Results: The findings indicate that students with field-independent cognitive styles exhibit better performance in the aspects of negation and reciprocity. They carefully apply problem-solving strategies, consistently reverting to initial values after achieving correct solutions. Conversely, students with field-dependent cognitive styles are more prone to errors, particularly in changing operation signs and applying the concept of reciprocal equivalence.Conclusion: This study highlights significant differences in reversible thinking between students with field-dependent and field-independent cognitive styles. The results suggest the need for tailored teaching methods to enhance reversible thinking based on cognitive styles. Further research is recommended to explore barriers and additional factors influencing reversible thinking.

MODELING HIV/AIDS USING SHAT MODEL Chandra, Tjang Daniel; Permata, Gloria Indah
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 17 No 2 (2023): BAREKENG: Journal of Mathematics and Its Applications
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/barekengvol17iss2pp0745-0756

HIV/AIDS gets on the list of deadly infectious diseases, but there is no right medicine and vaccination for it until now. Indonesia is also inseparable from the spread of HIV/AIDS year by year number of people living with HIV/AIDS in Indonesia continues to grow. The peak of HIV cases over the last twelve years (starting from 2020) in Indonesia was 50,282 cases in 2019, then the peak of AIDS was 12,214 in 2013. The purpose of the study is to model the spread of HIV/AIDS and test it with data on the growth of HIV/AIDS in Indonesia from 2006 to 2018. The steps taken in conducting this research are to determine the equilibrium point, calculate the basic reproduction number, analyze the stability of the equilibrium point, and numeric simulation of the SHAT model with the Maple 18 tool. Numerical simulation produces a value of . Based on calculations using the Routh-Hurwitz table, we can find that the system will be asymptotically stable towards a disease-free equilibrium point, namely . Based on the results obtained, it can conclude that HIV/AIDS will not become an epidemic in Indonesia.

The Innovation of Beetroot-based Processed Products to Improve Women's Economy in Padusan Village, Pacet District, Mojokerto Regency Irawati, Santi; Rahmadani, Desi; Chandra, Tjang Daniel; Soseco, Thomas; Nurjanah, Nunung
Journal of Education for Sustainability and Diversity Vol. 2 No. 2 (2024)
Publisher : Angstrom Centre of Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.57142/jesd.v2i2.350

Padusan Village, located in the Mojokerto district, has been identified as having significant potential for beetroot processing. In response to this opportunity, a community service team embarked on a project to empower local women by providing them with the necessary skills and knowledge to produce a variety of beetroot-based processed products. These products included beetroot tepung, crackers, cheese sticks, and wedang wuluh drinks. Throughout the initiative, the women were closely supported by students specializing in catering, who guided them through each step of the production process, from familiarizing them with the ingredients to mastering the art of dough preparation. They demonstrated remarkable progress in their understanding of food processing techniques and showed enthusiasm in exploring the diverse culinary possibilities offered by beetroot. Looking ahead, future community service endeavors aim to further empower these women by facilitating the transition to large-scale production and providing assistance in developing effective marketing strategies. By leveraging their newfound skills and tapping into potential market demand, the women of Padusan Village can enhance their economic prospects and contribute to the growth and prosperity of their community.

Analisis Kesalahan Siswa Berdasarkan Teori Newman dalam Menyelesaikan Soal Cerita Materi Lingkaran Mustaghisa, Agis; Chandra, Tjang Daniel
Kognitif: Jurnal Riset HOTS Pendidikan Matematika Vol. 4 No. 3 (2024): July - September 2024
Publisher : Education and Talent Development Center Indonesia (ETDC Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/kognitif.v4i3.2025

Kesulitan yang dialami oleh siswa dalam menyelesaikan soal materi lingkaran, menyebabkan banyaknya siswa yang yang melakukan kesalahan pada saat mengerjakan soal. Penelitian ini bertujuan untuk menganalisis kesalahan siswa dalam menyelesaikan soal cerita materi lingkaran berdasarkan pada teori Newman serta faktor-faktor penyebabnya. Penelitian ini dilaksanakan di SMP Shalahuddin Malang dengan subjek pada penelitian ini adalah tiga orang siswa kelas VII A SMP Shalahuddin Malang yang diambil berdasarkan pada tingkat siswa dengan kemampuan atas, sedang, dan rendah. Data pada penelitian ini diperoleh dari hasil pengerjaan soal tes tulis hasil pengerjaan siswa yang dilanjutkan dengan proses wawancara berdasarkan hasil jawaban tersebut. Data dianalisis dengan menggunakan kerangka kerja analisis Miles & Huberman, yaitu reduksi data, penyajian data, dan penarikan kesimpulan. Penelitian ini menunjukkan bahwa beberapa jenis kesalahan yang dilakukan oleh siswa dalam menyelesaikan soal cerita matematika materi lingkaran ini berdasarkan pada teori Newman, diantaranya yakni kesalahan siswa pada tahap memahami masalah, yakni siswa kurang memahami masalah yang harus diselesaiakan sesuai dengan apa yang diminta pada soal. Kesalahan pada tahap transformasi, yakni siswa salah dalam menggunakan pendekatan atau rumus yang akan digunakan. Kesalahan pada tahap keterampilan proses, siswa belum mampu melakukan operasi hitung dengan prosedur atau langkah-langkah yang benar pada saat pengerjaan soal. Kesalahan pada tahap penulisan jawaban akhir, yakni siswa tidak membuat kesimpulan, tidak menemukan jawaban akhir, tidak menuliskan satuan pada akhir jawaban

Analisis Peningkatan Level Berpikir Geometri Mahasiswa Berdasarkan Teori Van Hiele dengan Pendekatan Konstruktivisme Renanda, Aini; Qohar, Abd.; Chandra, Tjang Daniel
Jurnal Tadris Matematika Vol 6 No 1 (2023)
Publisher : Universitas Islam Negeri Sayyid Ali Rahmatullah Tulungagung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21274/jtm.2023.6.1.101-114

The provision of problem-solving, analytical, systematic, critical, and creative skills is important to improve human resources that can be obtained from learning mathematics. Geometry is a field of mathematics that aims to develop logical thinking skills, develop spatial intuition, and interpret mathematical arguments. Several studies show that students' understanding of geometry material is still at a low level, so it is necessary to develop or improve the geometry learning process. The purpose of this study is to describe the increase in students' geometric thinking levels based on Van Hiele's theory with a constructivism approach. The method used in this research is descriptive qualitative with data analysis techniques using the Miles & Huberman model in the form of data reduction, data presentation, and drawing conclusions. The results showed that before the learning process using a constructivist approach, students' geometric thinking skills were at levels 1 to 3 or the analysis stage to a formal deduction with the average being at the informal deduction and pre-formal deduction stages. Meanwhile, after the learning process using a constructivist approach was carried out, geometric thinking skills increased at levels 2 to 4 or the informal deduction stage to the rigor with an average increase in the formal deduction stage.

Analisis Kesalahan Representasi Matematis Siswa dalam Menyelesaikan Masalah Open-Ended Materi SMP Aritmetika Sosial Permatasari, Putri Intan; Sadijah, Cholis; Chandra, Tjang Daniel
BRILIANT: Jurnal Riset dan Konseptual Vol 6 No 3 (2021): Volume 6 Nomor 3, Agustus 2021
Publisher : Universitas Nahdlatul Ulama Blitar

Penelitian ini bertujuan mendeskripsikanajenis kesalahan yang dilakukan siswa dalam menyelesaikan masalah open-ended pada materi aritmetika sosial. Penelitian ini merupakan penelitian kualitatif deskriptif. Prosedur penelitian yang dilakukan peneliti terdiri dari beberapa tahap, yaitu: tahap observasi, tahap perencanaan, dan tahap pelaksanaan. Subjek dalam penelitian ini adalah siswa kelas VIII SMPN 1 Cluring sebanyak 32 orang. Teknik pengumpulan data ini menggunakan metode tes dan wawancara. Teknik analisis data melalui proses reduksi data, penyajian data, verifikasi dan penarikan kesimpulan. Berdasarkan analisis data diperoleh bahwa siswa mengalami kesalahan konseptual, prosedural, dan teknikal pada representasi visual, simbol, dan verbal.

Kemampuan Berpikir Kritis Siswa SMP dalam Menyelesaikan Asesmen Kompetensi Minimum Numerasi Ditinjau dari Efikasi Diri Widya, Laurentcia Noviafta; Sa'dijah, Cholis; Chandra, Tjang Daniel
Jurnal Paedagogy Vol. 10 No. 4: Jurnal Paedagogy (October 2023)
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jp.v10i4.9170

This research analyzes students' critical thinking abilities in solving Minimum Competency Assessment (AKM) questions by reviewing students' mathematical self-efficacy. This research used a descriptive method with a qualitative approach. The research subjects were 52 class VIII students at SMPK Mardi Wiyata Malang. This research instrument used AKM test sheets and mathematical self-efficacy questionnaires, which are then analyzed using an interactive model. This research showed that students with low self-efficacy abilities fulfill the indicators of interpretation, inference, evaluation, and explanation. Meanwhile, students with moderate self-efficacy fulfill the indicators of interpretation, inference, evaluation, explanation, and self-regulation. Students with high self-efficacy fulfill all indicators of critical thinking, namely interpretation, analysis, inference, evaluation, explanation, and self-regulation.

Kemampuan Komunikasi Matematis Tulis Siswa Bergaya Belajar Visual Dalam Menyelesaikan Masalah Ditinjau dari Perbedaan Gender Baehaqi, Mohammad Romdhon; Parta, I Nengah; Chandra, Tjang Daniel
Jurnal Cendekia : Jurnal Pendidikan Matematika Vol 7 No 1: Jurnal Cendekia: Jurnal Pendidikan Matematika Volume 7 Nomor 1 Tahun 2023
Publisher : Mathematics Education Study Program

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/cendekia.v7i1.1978

Tujuan penelitian ini adalah untuk mendeskripsikan kemampuan komunikasi matematis tulis siswa dengan gaya belajar visual saat menyelesaikan masalah ditinjau dari perbedaan gender. Metode penelitian yang digunakan yaitu deskriptif kualitatif. Penelitian ini dilakukan di SMPN 1 Gresik kelas VIII-C yang berjumlah 31 siswa. Selanjutnya dipilih 2 siswa dengan gaya belajar visual, 1 laki-laki dan 1 perempuan. Instrumen pada penelitian ini yaitu angket gaya belajar siswa, soal tes tulis, dan pedoman wawancara. Indikator komunikasi matematis yang digunakan dalam penelitian ini diambil dari indikator NCTM kemudian digabungkan dengan langkah pemecahan masalah Polya. Hasil penelitian menunjukkan bahwa komunikasi matematis tulis siswa visual dalam menyelesaikan masalah siswa perempuan cenderung lebih sistematis dan rinci ketika melakukan perhitungan. Siswa perempuan mampu menggunakan bahasa matematis dan mengomunikasikan pemikiran matematisnya dalam menyelesaikan masalah yang diberikan. Sedangkan siswa laki-laki dalam mengomunikasikan pemikiran matematisnya cenderung lebih singkat dan melakukan kesalahan perhitungan ketika menyelesaikan masalah.

Students' Creative Thinking in Solving Integrated Mathematical Problems Cultural Context Reviewed Based on Specialization Zahroh, Indrani Eka Prastya; Anwar, Lathiful; Chandra, Tjang Daniel
PRISMA Vol 14, No 2 (2025): PRISMA
Publisher : Universitas Suryakancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35194/jp.v14i2.5817

Creativity in mathematics is essential for developing students’ problem-solving skills and innovation, yet in Indonesia, students’ creative thinking remains low, as shown by PISA and TIMSS results, indicating a significant gap between expectations and current practices in mathematics learning. To address this issue, this study aimed to analyze the creative thinking characteristics of Grade IX students when solving culturally integrated mathematical problems, while also considering differences among student specialization groups: Mathematics, Science (IPA), and Social Studies (IPS). The research employed a qualitative case study design involving 30 students from a junior high school in Malang City during the 2024/2025 academic year. Based on a creative thinking test, 15 students (6 mathematics, 5 science, and 4 social studies specialization) were selected for in-depth interviews. Data were analyzed through several stages: preparation, coding, categorization, presentation of findings, interpretation, and validation. The findings revealed distinct creative thinking characteristics across the three groups. Mathematics specialization students demonstrated strong fluency through generating many ideas, filtering logical ideas, and responding quickly; flexibility through diverse approaches and adaptability; and originality through expressing unique and innovative solutions. Science specialization students showed similar traits in fluency and flexibility, with originality evident in their ability to create and articulate unique ideas. Social studies specialization students demonstrated fluency and flexibility but lacked originality characteristics. These results highlight variations in creative thinking profiles among different specialization groups and emphasize the importance of targeted instructional strategies to foster creativity in mathematics education.

Co-Authors Abadyo Abadyo Abdur Rahman As’ari Achmad Faruq Achmad Faruq, Achmad Adika Setyo Budi Lestari Agung Prasetyo Abadi Agustin, Nana Maulidah Aini Renanda Alifiana Mareta Andika Setyo Budi Lestari Anis Suraida Safitri Anita Dwi Septian Anita, Yuli Arlina Trie Cahyono Atmaja, Muhammad Galih Aziz Rizky Muhdiyanto Baehaqi, Mohammad Romdhon Cholis Sadijah, Cholis Cholis Sa’dijah Dahliatul Hasanah Dwi Hidayanti, Dwi Dwi Roudhotillah Dwiyana Dwiyana Edy Bambang Irawan Erry Hidayanto Fadhila Kartika Sari Fauzan, Hakmi Rais Fauziyyah Alimuddin Ferdiansyah, Hanief Febry Fidia Lestariningsih Hery Susanto Hery Susanto I Made Sulandra I Nengah Parta Ida Ayu Putu Sri Widnyani Ika Rahayu Sintiya Dewi Indrawatiningsih, Nonik Ipung Yuwono Ipung Yuwono, Ipung Kamaliyah Kadir Kridha Pusawidjayanti Lathiful Anwar Laurentcia Noviafta Widya Lestari, Andika Setyo Budi Makbul Muksar Marini Marini Maughfiroh Firdausi, Unzil Mayangsari, Aprilia Dwi Muhammad Galih Atmaja Mukhammad Solikhin Mustaghisa, Agis Nana Maulidah Agustin Nathasa Pramudita Irianti Nathasa Pramudita Irianti, Nathasa Pramudita Nunung Nurjanah Nuratiqoh, Nuratiqoh Nurul Audhifa Utami Permata, Gloria Indah Permatasari, Putri Intan Pradina Parameswari Purwanto Purwanto Purwosetiyono, Fransiskus Xaverius Didik Putri, Agesta Ameliya Putu Evi Paramithasari Wardana Qohar, Abd. Rachmalia Vinda Kusuma Rahmadani, Desi Rani Martalisa Taorina Renanda, Aini Reza Umami Khoirunisa' Rianti Mandasari Rizka Zulvana Wardhani Roudhotillah, Dwi Rustanto Rahardi Saddam Hussen Saputri, Risma Rintias Sari, Feti Eka Ratna Sisworo Sri Mulyati Sri Mulyati Subanji Subanji Susilawati Susilawati Susiswo Swasono Rahardjo Syaiful Hamzah Nasution Thomas Soseco Toto Nusantara Varetha Lisarani Vita Kusumasari Wasilatul Murtafiah Widya, Laurentcia Noviafta Zahroh, Indrani Eka Prastya Zida Amalia

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