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All Journal Jurnal PAJAR (Pendidikan dan Pengajaran) Jurnal Perspektif
KMS Muhammad Amin Fauzi
State University of Medan
Arts Economics, Econometrics & Finance Education Engineering Other

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Validity and Reliability Analysis of a Contextual Problem-Based Essay Test For Mathematical Critical Thinking on Cubes and Rectangular Prisms Imelda; Izwita Dewi; KMS Muhammad Amin Fauzi
Jurnal PAJAR (Pendidikan dan Pengajaran) Vol. 10 No. 4 (2026): July
Publisher : Laboratorium Program Studi Pendidikan Guru Sekolah Dasar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33578/pjr.v10i4.1580

Abstract

This study aimed to develop and evaluate a contextual problem-based essay test for assessing students' mathematical critical thinking skills on the topics of cubes and rectangular prisms. A quantitative descriptive design was employed involving 30 ninth-grade students from SMPN 31 Medan during the pilot-testing stage. Prior to implementation, the instrument was evaluated by expert validators to establish content validity. Empirical item validity was analyzed using the Pearson Product–Moment correlation coefficient, while internal consistency reliability was estimated using Cronbach's Alpha. The findings showed that all essay items met the criterion of empirical validity and that the instrument demonstrated moderate internal consistency, indicating its suitability for preliminary classroom assessment and pilot testing. The developed instrument assesses higher-order cognitive processes based on Facione's critical thinking framework, including interpretation, analysis, evaluation, inference, and explanation, through authentic contextual geometry problems. This study contributes to mathematics education by providing a contextually relevant assessment instrument with preliminary psychometric evidence that can support teachers in implementing authentic assessment of mathematical critical thinking skills. The findings also provide a foundation for future large-scale validation studies aimed at developing standardized assessment instruments for mathematics education.
Development of PBL-Based Worksheets with the Alef Education Platform to Improve Mathematical Reasoning and Independent Learning Skills in Islamic Junior High School Students Nurhasana A. L. Sirait; KMS Muhammad Amin Fauzi; Hasratuddin Hasratuddin
Jurnal Perspektif Vol 9 No 1 (2025): Jurnal Perspektif
Publisher : UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/jp.v9i1.351

Abstract

The purpose of this study was to determine the validity, practicality, and effectiveness of student worksheets (LKPD) based on PBL assisted by the Alef Education platform, improving students' mathematical reasoning skills, and improving students' learning independence. The type of research used is research and development, the development model used is the Thiagarajan, Semmel learning model, namely the 4-D model. The study was conducted in class VII MTsN Toba Samosir, the research sample was 30 students. The results of the study showed that the LKPD developed was declared valid, practical and effective, the increase in reasoning skills and learning independence of students who learned using LKPD developed with the PBL model assisted by the Alef Education Platform seen from the n-gain was stated to have increased. For this reason, PBL using LKPD assisted by the Alef Education platform can be an alternative for learning mathematics for class VII students.
Co-Authors Hasratuddin Hasratuddin Imelda Imelda Izwita Dewi Nurhasana A. L. Sirait