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All Journal MATEMATIKA DAN PEMBELAJARAN Journal of Islamic Monetary Economics and Finance Jurnal Ilmiah Pendidikan Matematika Al Qalasadi MATH LOCUS: Jurnal Riset dan Inovasi Pendidikan Matematika Al-Alam : Islamic Natural Science Education Journal Jurnal Pendidikan Matematika Universitas Lampung
Lessy, Djaffar
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Computer Science & IT Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Environmental Science Mathematics

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Penerapan Model Pembelajaran Problem Based Learning (PBL) untuk Meningkatkan Hasil Belajar IPA Anita, Wa; Lessy, Djaffar
Al-Alam: Islamic Science Education Journal Vol 3 No 1 (2024): (Edisi Januari) Pendekatan dan Model Pembelajaran IPA
Publisher : LP2M IAIN Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33477/al-alam.v3i1.7302

Abstract

This research is motivated by the monotony of the teacher's use of the lecture method in learning which has an impact on low student learning outcomes. The purpose of this study was to determine the increase in student learning outcomes through the application of problem-based learning models in science subjects. This research is a class action research. The subjects of this study were 25 class VIII students of SMP Negeri 23 Ambon. The results showed that the learning outcomes of students in the material of the human excretory system after the problem based learning model was applied in cycle I there were 10 students (40%) who completed while those who did not complete were 15 people (60%), in cycle II there were 23 people (92%) who completed while those who did not complete were 2 people (8%). The results of this study indicate that the application of the problem based learning model can improve the learning outcomes of class VIII students in the subject of the human excretory system at SMP Negeri 23 Ambon.
ANALYSIS OF STUDENT NUMERACY LITERACY IN SOLVING PISA QUESTIONS Sopamena, Patma; Rahmawati, Intan; Lessy, Djaffar; Ma'aruf, Salmiati
MATEMATIKA DAN PEMBELAJARAN Vol. 11 No. 2 (2023): MATEMATIKA DAN PEMBELAJARAN
Publisher : IAIN Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33477/mp.v11i2.5517

Abstract

This study aims to describe the process of student numeracy literacy in solving PISA questions. This study used a qualitative descriptive approach. The subjects in the study were two people from 34 students of 9th grade B MTs N Ambon as participants, with data acquisition including observations, interviews, and numeracy literacy ability tests from PISA questions. Data analysis techniques use data classification, data reduction, data presentation, data interpretation, and conclusions.   The results of this study show that: 1) both students have the ability of the main competencies in numeracy literacy, namely capable; of communicating problems, making mathematical models, making representations, arguing and giving appropriate reasons in accountability for their work, making good and correct solving strategies, use formal language, symbol language and technical language and use mathematical tools to facilitate their work. 2) There are differences in the solution of the two students, namely in solving problem number one, there are students who make mathematical modeling with the basic formula of comparison and there are students who make mathematical modeling with the opposite of the basic formula of comparison, namely multiplication.
Etnomatematika Masyarakat Kecamatan Pulau Gorom: Studi Kasus Masyarakat Di Daerah Pesisir Pantai Safruddin, Safruddin; Marhayati, Marhayati; Lessy, Djaffar; Sopamena, Patma
Jurnal Ilmiah Pendidikan Matematika Al Qalasadi Vol 8 No 2 (2024): JURNAL ILMIAH PENDIDIKAN MATEMATIKA AL QALASADI
Publisher : Prodi Pendidikan Matematika, Fakultas Tarbiyah dan Ilmu Keguruan IAIN Langsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32505/qalasadi.v8i2.9236

Abstract

Penelitian ini merupakan penelitian eksploratif . Metode pengumpulan data pada penelitian ini menggunakan observasi, wawancara, dokumentasi, serta studi pustaka (literatur). Tujuan penelitiaan ini untuk mengeksplorasi, mengidentifikasi, dan mengungkapkan kegiatan masyarakat pesisir pantai Kecamatan Pulau Gorom, khususnya yang berprofesi sebagai nelayan. Hasil dari penelitian ini menunjukkan bahwa aktivitas masyarakat pesisir yang berprofesi sebagai nelayan di Kecamatan Pulau Gorom Desa Sikaru dalam kehidupan sehari-harinya menunjukkan adanya keterkaitan dengan konsep matematika. Konsep matematika yang termuat dalam kehidupan keseharian masyarakat pesisir Kecamatan Pulau Gorom meliputi materi operasi bilangan, operasi bentuk aljabar, himpunan, sistem persamaan linier, dan aritmetika sosial. Konsep matematika yang digunakan masih bersifat matematika tradisional seperti mengukur panjang atau lebar menggunakan depa atau jengkal sehingga ukuran panjang seperti 2 depa atau 2 jengkal panjangnya berbeda-beda karena perbedaan panjang depa dan jengkal setiap orang berbeda. Jenis etnomatematika yang ditemukan pada saat persiapan pengasapan hingga pemasaran ikan julung meliputi pengatuan tata letak pengasapan, pengukuran dan proporsi ikan, penentuan waktu dalam pengasapan, penggunaan volume dan rasio bahan bakar (kayu api), dan penentuan ketinggian dan jarak pengasapan.
Pengaruh Pendekatan Science Environment Technology and Society pada Materi Pencemaran Lingkungan terhadap Kemampuan Literasi Sains Siswa Rabadia, Hufila Ode; Lessy, Djaffar; Asshagab, Siti Mutiaraningsih; Mursalin, Enggal
Al-Alam: Islamic Science Education Journal Vol 3 No 2 (2024): (Edisi Juli) Model dan Pendekatan Pembelajaran IPA
Publisher : LP2M IAIN Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33477/al-alam.v3i2.9228

Abstract

Penelitian ini dilakukan untuk mengetahui pengaruh pendekatan Science Environment Technology and Society pada Materi Pencemaran Lingkungan terhadap Kemampuan Literasi Sains Siswa Kelas VII di MTs Nurul Huda Limboro. Penelitian ini menggunakan metode quasi eksperiment dengan desain penelitian nonequivalent control group design. Seluruh siswa kelas VII terlibat sebagai populasi dan sampel diambil dengan menggunakan purposive random sampling dimana kelas VII A sebagai kelas eksperimen dan kelas VII B sebagai kelas kontrol. Pengumpulan data dilakukan dengan menggunakan soal tes kemampuan literasi sains. Teknik pengolahan data melalui uji normalitas, homogenitas, dan uji independent samples t-test dengan bantuan SPSS Statistic 27. Hasil data posttest dengan menggunakan software SPSS Statistic 27 memperoleh nilai signifikansi uji independent samples t-test yaitu sebesar 0,000 < (α) 0,05 yang artinya H0 ditolak dan H1 diterima, ini menunjukkan bahwa penggunaan pendekatan Science Environment Technology and Society berpengaruh dalam meningkatkan kemampuan literasi sains siswa.
Mengenal Bentuk Bangun Ruang pada Sumur/Parigi Pusaka di Desa Lonthoir Banda Neira Maluku Tengah Murad, Masriani; Sopamena, Patma; Lessy, Djaffar; Marhayati
MATH LOCUS: Jurnal Riset dan Inovasi Pendidikan Matematika Vol. 5 No. 2 (2024): MATH LOCUS: Jurnal Riset dan Inovasi Pendidikan Matematika
Publisher : Universitas Tidar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31002/mathlocus.v5i2.4395

Abstract

Penelitian ini bertujuan mengeksplorasi hubungan antara matematika dan budaya melalui studi kasus sumur/parigi Pusaka di desa Lonthoir, Banda Neira, Maluku. Dalam menghadapi tantangan globalisasi, penelitian ini menyoroti peran pendidikan dalam menjaga budaya lokal dengan mengintegrasikan matematika. Tradisi cuci sumur/parigi Pusaka yang diadakan setiap sepuluh tahun,menunjukkan penerapan konsep matematika seperti simetri dan bentuk geometris dalam arsitektur dan ornamen sumur. Metode penelitian yang digunakan adalah etnografi dengan pendekatan kualitatif dan analisis dokumen. Hasil penelitian ini menemukan bahwa masyarakat desa Lonthoir menerapkan konsep geometri dalam pembangunan sumur mereka. Nilai-nilai kebersamaan dan kearifan lokal juga mempengaruhi proses ini. Temuan ini menegaskan pentingnya etnomatematika dalam pendidikan, menawarkan pemahaman yang lebih inklusif tentang konsep bangun ruang dalam matematika khususnya materi balok dan prisma segi delapan.
A BAYESIAN GAME FOR A PROFIT AND LOSS SHARING CONTRACT Lessy, Djaffar; Diener, Marc; Diener, Francine
Journal of Islamic Monetary Economics and Finance Vol. 7 No. 3 (2021)
Publisher : Bank Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21098/jimf.v7i3.1367

Abstract

This paper presents a Bayesian game model for a profit-and-loss sharing (PLS) contract. We develop the model in two parts, one for a non-social bank and the other for a social bank. The model is proposed to reduce the adverse selection problem inherent in PLS contracts. The game starts with incomplete information; Islamic banks do not know exactly what type of agent is applying for a PLS contract, and whether the agents are efficient or non-efficient. We assume that the banks assign the agent type to a prior probability. Determination of the profit-sharing ratio of the contract is then discussed, and we look for the Bayesian Nash equilibrium as a solution or outcome of the game. We show that banks offer interesting but risky contracts to agents if they assign high probability to the agents being efficient. In contrast, they offer less risky contracts if they assign high probability to the agents being non-efficient. The results can be considered by Islamic banks to reduce the adverse selection problem in PLS contracts.
Binongko Multiplication: An Ethnomathematics Method to Adress Mathematical Challenges Among the Butonese Ethnic Group in Masohi City Aspin, La; Lessy, Djaffar; Sopamena, Patma
Jurnal Pendidikan Matematika Universitas Lampung Vol. 13 No. 2 (2025): Jurnal Pendidikan Matematika Universitas Lampung
Publisher : Faculty of Teacher Training and Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/mtk/v13i2.pp124-140

Abstract

Ethnomathematics is defined as the specific methods used by a particular cultural group or society in mathematical activities. This study aims to explain the elements of ethnomathematics found in the term kali-kali binongko and how it can be applied in mathematics learning. The method used in this article is an ethnographic approach, with a qualitative research design. Data were collected through semi-structured interviews, observation, and documentation. The data analysis process in this study consisted of three stages: data reduction, data presentation, and drawing conclusions. The results of this study reveal the presence of ethnomathematics in the application of kali-kali binongko among the Buton tribe in Masohi City. The ethnomathematical aspects of kali-kali binongko practiced by the Buton tribe in Masohi can be explained through three main findings: (1) The history and culture of the Buton tribe, (2) Ethnomathematical elements found in kali-kali binongko, including: a. Number systems, b. Determining marriage dates, c. Mathematical knowledge in agricultural practices, d. Mathematical knowledge in fishing activities, and e. The application of kali-kali binongko in trading activities, (3) The discovery of a mathematical concept referred to as “hidden mathematics” or “frozen mathematics” among the Buton tribe, which includes naming counting activities based on the number of days in a new month, following the traditional practice of counting the moon’s phases in the sky.
Co-Authors Anita, Wa Aspin, La Asshagab, Siti Mutiaraningsih Diener, Francine Diener, Marc Enggal Mursalin Intan Rahmawati Ma'aruf, Salmiati Marhayati Marhayati Murad, Masriani Rabadia, Hufila Ode Safruddin . Sopamena, Patma