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Jurnal Ilmiah Matematika (JIMAT)
Published by Institut Sains dan Kependidikan Kie Raha Maluku Utara
ISSN : -     EISSN : 27741729     DOI : https://doi.org/10.5281/zenodo.
Core Subject : Education,
Education Mathematics
Jurnal Ilmiah Matematika (JIMAT) adalah terbitan berkala ilmiah (e-ISSN: 2774-1729) yang menyajikan informasi-informasi terkini di bidang Pendidikan Matematika dan Sains Matematika, melalui artikel-artikel baik yang berbasis penelitian lapangan maupun kajian literatur. Melalui terbitan-terbitan ini, JIMAT menempuh misi untuk mendistribusikan informasi serta mengembangkan ilmu pengetahuan khususnya di bidang Pendidikan Matematika dan Sains Matematika. Dengan menggunakan Open Journal System (OJS), JIMAT dapat diakses secara luas dan para peneliti dapat men-submit hasil-hasil penelitian yang dikemas dalam bentuk artikel dengan mengikuti panduan-panduan yang telah disediakan oleh JIMAT.
Arjuna Subject : Matematika - Aljabar dan Teori Bilangan
Articles 183 Documents
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Evaluasi Pembelajaran Matematika Berpusat Pada Siswa Pada Materi Peluang Dengan Model Context, Input, Process, and Product (CIPP) Kirana Julianti Isra; Ode Zulaeha; Rusmin R.M Saleh
JIMAT: Jurnal Ilmiah Matematika Vol 7 No 4 (2026): Oktober-Desember 2026
Publisher : Program Studi Pendidikan Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63976/jimat.v7i4.1599

Abstract

This study evaluated the implementation of student-centered mathematics learning on probability within Indonesia’s Merdeka Curriculum. A descriptive evaluative design used the Context, Input, Process, and Product (CIPP) model. Participants were 20 Grade 10 students and one mathematics teacher at SMA Negeri 3 Halmahera Timur during the first semester of 2025/2026. Data were collected through teacher observation, student observation, and documentation and converted into percentages of maximum scores. Recalculation of the source records yielded 62.03% for Context (good), 62.50% for Input (good), 80.77% for Process (very good), and 76.00% for Product (good). The Process score combined teacher scores of 25/36 and student scores of 521/640 using maximum-score weighting; the mean across the four CIPP components was 70.33% (good). Student participation in discussion, presentation, and reflection was relatively strong, whereas resource readiness and the traceability of context measurement require improvement. Because the study did not use pretests, posttests, a comparison group, or an independent measure of conceptual mastery, the findings do not establish a causal effect of student-centered learning on achievement. The evaluation supports improving media and learning resources, consistent rubrics, learning-outcome assessment, and repeated observation.
Model Matematika Dinamika Misinformasi dengan Intervensi Fact-Checking pada Interaksi Digital Nur Rezky Rahamadhan; Danial Danial
JIMAT: Jurnal Ilmiah Matematika Vol 7 No 4 (2026): Oktober-Desember 2026
Publisher : Program Studi Pendidikan Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63976/jimat.v7i4.1618

Abstract

Misinformation can persist in digital interactions even after corrections have been provided, highlighting the need for an analytical measure of intervention intensity capable of changing its dynamical regime. This study develops a three-state mathematical model consisting of individuals who do not believe misinformation and are not undergoing active correction, individuals who believe misinformation, and individuals who have received corrective information. Fact-checking intervention is modeled as a constant additional correction rate. The analysis encompasses conservation and positive invariance, equilibria, local stability, bifurcation, center manifold analysis, sensitivity analysis, and numerical simulations using the fourth-order Runge–Kutta method. The model yields a persistence index that decreases with increasing fact-checking intensity and an explicit intervention threshold. Under the assumed simulation parameters, this threshold is 0.20. Below the threshold, increasing intervention intensity reduces the equilibrium proportion of individuals believing misinformation but does not eliminate its persistence. At the threshold, two equilibrium branches exchange stability through a transcritical bifurcation, and the system exhibits critical slowing down. Simulations up to time 3000 show that the scaled values of misinformation prevalence, the corrected state, and the distance from the misinformation-free equilibrium approach asymptotic constants of 0.5, 2, and 2.5, respectively. Above the threshold, the misinformation-free equilibrium becomes stable. Numerical verification using step sizes of 0.02 and 0.01 yields conservation errors on the order of 10-14 and differences between numerical trajectories on the order of 10-13. These findings distinguish subcritical interventions, which merely reduce misinformation persistence, from supercritical interventions, which induce a change in the dynamical regime. All model parameters and initial conditions are assumed for simulation purposes and are not estimated from empirical data on digital platform users.
Analisis Dinamika Risiko Kredit, Efisiensi Operasional, dan Likuiditas terhadap Profitabilitas PT. Bank Mandiri (Persero) Tbk. Menggunakan Regresi Linear Ganda Muh. Fatur Rahman; Muh. Randi Tri Suhartarto; Hisyam Ihsan
JIMAT: Jurnal Ilmiah Matematika Vol 7 No 4 (2026): Oktober-Desember 2026
Publisher : Program Studi Pendidikan Matematika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63976/jimat.v7i4.1619

Abstract

This study aims to examine the relationship between credit risk, operational efficiency, and liquidity with the profitability of PT Bank Mandiri (Persero) Tbk. using multiple linear regression. This research employs a quantitative approach with an associative research design, based on secondary data consisting of quarterly financial ratios from the first quarter of 2015 to the second quarter of 2026, totaling 46 observations. Credit risk is measured using the Gross Non-Performing Loan (NPL) ratio, operational efficiency using the Operating Expenses to Operating Income (BOPO) ratio, liquidity using the Loan to Deposit Ratio (LDR), and profitability using Return on Assets (ROA). Data analysis was conducted using RStudio, covering descriptive statistics, multiple linear regression, significance testing, coefficient of determination, and classical assumption tests. The results indicate that BOPO has a negative and significant relationship with ROA, while LDR has a positive and significant relationship. Gross NPL does not have a statistically significant relationship with ROA. Simultaneously, the three independent variables have a significant relationship with ROA, with a coefficient of determination of 82.85%. However, the classical assumption tests indicate the presence of heteroscedasticity and autocorrelation in the residuals, requiring the results to be interpreted with caution. Overall, operational efficiency is closely associated with Bank Mandiri's profitability. Future research is recommended to employ methods suitable for time-series data characteristics, incorporate additional internal and external banking variables, and extend the observation period or include multiple banks to obtain more comprehensive findings.

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