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All Journal BIOLINK (Jurnal Biologi Lingkungan, Industri, Kesehatan) EKSAKTA : Jurnal Penelitian dan Pembelajaran MIPA Jurnal Biolokus: Jurnal Penelitian Pendidikan Biologi dan Biologi Martabe : Jurnal Pengabdian Kepada Masyarakat PeTeKa NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Jurnal Paedagogy Journal of Natural Sciences Jurnal Pijar MIPA
Sahlan Tuah
Universitas Muhammadiyah Tapanuli Selatan
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemistry Economics, Econometrics & Finance Education Environmental Science Languange, Linguistic, Communication & Media Mathematics Physics Social Sciences Other

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MODEL PEMBELAJARAN KONTEKSTUAL DALAM PENINGKATAN KEMAMPUAN BERPIKIR KRITIS BELAJAR BIOLOGI SISWA DI SMA MUHAMMADIYAH 11 PADANGSIDIMPUAN Tuah, Sahlan
PeTeKa (Jurnal Penelitian Tindakan Kelas dan Pengembangan Pembelajaran) Vol 7, No 1 (2024): PeTeKa (Jurnal Penelitian Tindakan Kelas dan Pengembangan Pembelajaran) Publish
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/ptk.v7i1.139-146

Abstract

The purpose of this study is to determine the improvement of critical thinking learning skills, increase in student biology learning activities, improve the management of biology learning through the application of contextual learning models on plantae material in grade X of SMA Muhammadiyah 11 Padangsidimpuan. The validation of the second cycle test above shows that from the questions prepared, 5 questions are invalid and 10 questions are valid according to the calculation. in the first cycle an average score of 74.32 was obtained with the number of students who completed it as many as 18 people and the remaining 7 students were declared incomplete with the applicable KKM score of 75, then the PKK score of the overall learning outcomes of the first cycle was 72.02%. In the second cycle, an average score of 78.4 was obtained with the number of students who completed reaching KKM, namely 75 was 21 people and the remaining 4 people were declared incomplete, obtained by PKK in the second cycle was 84.18% categorized (Very Good).
PENERAPAN PENDEKATAN KONTEKSTUAL BERBANTUAN LEMBAR KERJA SISWA (LKS) TERHADAP PENINGKATAN HASIL BELAJAR SISWA DI SMA NEGERI 6 PADANGSIDIMPUAN Tuah, Sahlan
NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Vol 10, No 12 (2023): NUSANTARA : Jurnal Ilmu Pengetahuan Sosial
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jips.v10i12.2023.5474-5485

Abstract

The problem in this study is that the learning process in the classroom is still carried out conventionally, where learning is still dominated by teachers. So far, students learn science only based on the material in the textbook and are very far from the real life of students The purpose of this study is to determine the improvement of student biology learning outcomes through the application of a contextual approach to Cell Reproduction material in class XII of SMA Negeri 6 Padangsidimpuan for the 2021-2022 academic year. This type of research is Classroom Action Research. Where the subject of the study was class XII students of SMA Negeri 6 Padangsidimpuan consisting of 29 students. While data collection techniques and tools are tests and observations. Based on the results of the biology learning outcomes test of cycle I students of 68.9% and cycle II of 82.7%. And the results of an increase in student activity levels in cycle I by 61.7% and in cycle II by 76.3% then an increase in teacher activity in managing learning cycle I by 73.6% and cycle II by 80%.
Implementasi Model Pembelajaran Diskusi Kelas Upaya Meningkatkan Minat Peserta Didik Di Kelas VIII MTs Muhammadiyah 22 Padangsidimpuan Bangun Ritonga, Sahor; Dongoran, Putoro; Tuah, Sahlan
NUSANTARA : Jurnal Ilmu Pengetahuan Sosial Vol 6, No 2 (2019): NUSANTARA : Jurnal Ilmu Pengetahuan Sosial
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jips.v6i2.2019.221-226

Abstract

Rumusan masalah dalam penelitian ini adalah kurangnya minat peserta didik terhadap mata pelajaran Pendidikan Pancasila dan Kewarganegaraan. Penelitian ini bertujuan untuk mengetahui seberapa besar implementasi model pembelajaran diskusi kelas upaya meningkatkan minat belajar mata pelajaran pendidikan pancasila dan kewarganegaraan. Jenis penelitian yang digunakan penulis adalah penelitian Asosiatif. Instrumen penelitian adalah angket . Penulis menetapkan skor tertinggi yaitu 5 dan terendah 1. Berdasarkan analisis diatas maka diperoleh rhitung  0,835 dengan melihat daftar rtabel dengan jumlah tabel 28, selanjutnya dikonsultasikan dengan rtabel dengan taraf kesalahan yang yang ditetapkan 1% maka diperoleh harga 0,478 ternyata rhitung lebih besar dari pada rtabel yakni 0,8350,478, maka hipotesis alternative (Ha) dapat diterima artinya ada implementasi model pembelajaran diskusi kelas upaya meningkatkan minat belajar peserta  didik  di  kelas  VIII  MTs  Muhammadiyah  22  Padangsidimpuan.
Exploration of Salam Leaf Extract (Syzygium polyanthum) as a Natural Indicator for Acid-Base Titration: Color Stability and Endpoint Accuracy Nasirsah, Nasirsah; Fatma, Fatma Suryani Harahap; Siregar, Rabiyatul Adawiyah; Siregar, Elda Sari; Tuah, Sahlan
Jurnal Pijar Mipa Vol. 20 No. 7 (2025)
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i7.10547

Abstract

Acid-base indicators play an important role in titration, but the use of synthetic indicators such as phenolphthalein is increasingly criticized for being toxic, carcinogenic, and environmentally unfriendly. Therefore, this study was conducted with the aim of developing bay leaf extract (Syzygium polyanthum) as a safer, natural indicator, thereby supporting the concept of green chemistry. The study was carried out in four stages, namely first, extraction with ethanol: water solvent (70:30 and 50:50), second, color change test in pH 4, 7, and 10 buffer solutions using visual documentation and UV-Vis spectrophotometry. Third, validation of effectiveness in HCl–NaOH titration with phenolphthalein as a comparator. Additionally, stability and reproducibility tests were conducted over a 7-day storage period. The results showed that bay leaf extract remained stable for at least seven days, exhibiting a significant λmax change profile at 405–425 nm, which varied according to pH changes. This indicates the sensitivity of phenolic pigments to acidic, neutral, and basic conditions. In titration validation, the extract with 50/50 solvent showed an identical titrant volume to phenolphthalein (25.0 mL; deviation 0%), while the 70/30 solvent showed a deviation of -14.6%. Stability tests showed that the extract was relatively stable for up to 7 days in dark conditions with a decrease in absorbance <10%, while reproducibility tests produced inter-user variations <5%. These findings suggest that bay leaf extract has strong potential as a reliable, stable, and consistent natural indicator, making it a worthy alternative to synthetic indicators in environmentally sustainable chemistry education and research laboratories.
Development of TPACK-Based Digital Economics Worksheets to Enhance Students’ Critical Thinking Skills Samakmur, Samakmur; Tuah, Sahlan; Husein, Ahmad
Jurnal Paedagogy Vol. 13 No. 1 (2026): January
Publisher : Universitas Pendidikan Mandalika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/jp.v13i1.19188

Abstract

This study aims to develop TPACK-based digital economics worksheets and to examine their validity, practicality, and effectiveness in enhancing students’ critical thinking skills. The research employed a Research and Development (R&D) method using the ADDIE model, which consists of the analysis, design, development, implementation, and evaluation stages. The participants were tenth-grade students at SMK Negeri 1 Angkola Timur, North Sumatra. The research instruments included expert validation sheets, teacher and student response questionnaires, critical thinking skill tests, and learning achievement tests. Data were analyzed using descriptive quantitative and qualitative methods, normality testing, N-Gain analysis, and effectiveness testing. The findings revealed that the developed digital worksheets were highly valid based on evaluations by content, media, and instructional design experts. The practicality analysis indicated that the worksheets were highly practical, as reflected in positive responses from both teachers and students. Furthermore, the implementation of the TPACK-based digital worksheets was proven to be effective in improving students’ critical thinking skills, as demonstrated by increased mean scores and moderate to high N-Gain values. Therefore, TPACK-based digital economics worksheets are suitable for use as innovative instructional materials in vocational high school economics learning.
PELATIHAN DAN PENDAMPINGAN PENGEMBANGAN MEDIA PEMBELAJARAN MENGGUNAKAN MICROSOFT POWER POINT DAN CAMTASIA DI SMAMUHAMMADIYAH 11 KOTA PADANGSIDIMPUAN Harahap, Andes Fuady; Tuah, Sahlan; Ariaji, Rizky; Mulyana, Viva
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 1, No 1 (2017): MARTABE : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v1i1.7-11

Abstract

Based on the analysis of the situation and the problems faced by the partners, the devotional team will provide a solution to overcome teacher difficulties in developing learning media. The solution will be in the form of training and mentor for teachers in developing learning media with software incombination with Microsoft PowerPoint and Camtasia. The results achieved in this IbM activity are (1) Positive feedback obtained from the school, teachers at SMA Muhammadiyah 11 Padangsidimpuan during the activity. (2) Increasing information on instructional media that can help learning materials for teachers. (3) Teachers can design instructional media that can be adapted to the circumstances surrounding environment. (4) The high motivation and demand for the development of lesson materials through the media more exciting learning.Keywords: Software On Combination Microsoft PowerPoint and Camtasia, Development of Learning Media.
PENDAMPINGAN PENGEMBANGAN MODEL PEMBELAJARAN KONTEKSTUALBERBASIS LIVING VALUES ACTIVITY BAGI GURU IPA SEKOLAH MUHAMMADIYAH KOTA PADANGSIDIMPUAN Tuah, Sahlan
Martabe : Jurnal Pengabdian Kepada Masyarakat Vol 9, No 1 (2026): MARTABE : JURNAL PENGABDIAN KEPADA MASYARAKAT
Publisher : Universitas Muhammadiyah Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31604/jpm.v9i1.505-512

Abstract

Pelatihan bertujuan untuk meningkatkan kemampuan guru secara teoritis dan praktis dalam menerapkan model pembelajaran kontekstual berbasis living values activity. Pelatihan ini menggunakan pendekatan participant-centered   dengan   integrasi   seminar-workshop-pendampingan.   Pelatihan   dilaksanakan di Ruabg Seminar UM-Tapsel bekerjasama dengan PD. Muhammadiyah Kota Padangsidimpuan dengan jumlah peserta sebanyak 19 orang guru IPA/Biologi . Hasil pelatihan: 1) Desain pelatihan mengintegrasikan seminar dan workshop dengan pendampingan. Kegiatan seminar dan workshop menggunakan model games, role play, case study, simulasi, maupun focused group discussion. Kegiatan pendampingan menggunakan model lesson study; 2) Setelah pelatihan guru menunjukkan beberapa kemampuan sebagai berikut: pemahaman teoritis terhadap model, kemampuan mengembangkan RPP model, dan kemampuan menerapkan model pembelajaran kontekstual berbasis living values activity dalam IPA /Biologi. Kesimpulan: Pelatihan praktis melalui pengintengrasian kegiatan seminar, workshop dan pendampingan dapat meningkatkan kemampuan teoritis dan praktis guru IPA/Biologi dalam menerapkan model pembelajaran kontekstual berbasis living values activity
Co-Authors Abubakar Abubakar Adrian, Muhammad Ahmad Husein, Ahmad Andes Fuady Dharma Harahap Andes Fuady Harahap Andes Fuady Harahap, Andes Arni Maya Atifah, Yusni Bangun Ritonga, Sahor Dakkal Harahap Dongoran, Putoro Elda Sari Siregar Elisa Elisa Elisa Elisa Fatma Suryani Harahap Fatma, Fatma Suryani Harahap Fauzi Siregar, Rahmat Gusmaniar, Gusmaniar Hamid Marpaung, Paisal Harahap, Andes Fuady Harahap, Andes Fuady Dharma Hasanah Nasution Heni Mulyani Pohan Herdiani Herdiani Ira Anugrah Jalilah Azizah Lubis N Ginting Nasirsah, Nasirsah Nur Sahara Nur Sahara Nurkholidah Siregar Nurmaini Ginting Padhilah, Suci Rabiyatul Adawiyah Siregar Rabiyatul Adawiyah Siregar Rizky Ariaji, Rizky Samakmur, Samakmur Saputra, Riska Siregar, Nurkholidah Viva Mulyana Viva Mulyana, Viva Zulhandri Zulhandri