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Uncovering Gaps in Deductive Geometry Thinking: Rasch-Based Evidence from Students’ Work on Quadratic Functions Fiki Alghadari; Bella Arisha; Nurul Hidayah; Saparuddin Saparuddin; Budi Eka Dharma
Journal of Instructional Mathematics Vol. 6 No. 2 (2025): Innovative Approaches to Mathematical Understanding and Literacy
Publisher : Pendidikan Matematika STKIP Kusuma Negara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37640/jim.v6i2.2510

Abstract

The deductive structure is fundamental in mathematics, but students often struggle to derive logical consequences when constructing proofs or engaging in the bridging process. This study analyzed students’ ability to deduce logical relationships between properties in geometric thinking on quadratic functions. The participants were students (N=139) from the mathematics education program. The properties of quadratic functions and their interrelationships contained in the premises represented students’ responses to the instrument. The responses were dichotomously coded based on the criteria of the carried-out deduction process and then evaluated using Rasch analysis. The findings revealed that, in general, the distribution of students’ ability levels was below most levels of the carried-out deduction process. Although a group of students had already reached the high-ability category, the overall distribution was still dominated by low-ability levels. Many students continued to face serious challenges in reaching the final stage of the deduction process—advanced premise integration and deductive synthesis—since most of them established relationships among properties merely from the given information. There were indications that learning experiences during higher education contributed positively to the improvement of students’ ability at the deduction level. The study recommends four steps to habituate students to the process of deduction.
Pelatihan Pengembangan Instrumen Penilaian Berpikir Kritis Terintegrasi Keterampilan Proses Sains Kriswantoro Kriswantoro; Suharli AJ; M Furqon; Budi Eka Dharma; Rahma Dani
Jurnal Abdimas Indonesia Vol. 5 No. 3 (2025)
Publisher : Perkumpulan Dosen Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34697/jai.v5i3.2000

Abstract

Pelatihan pengembangan instrumen penilaian berpikir kritis terintegrasi keterampilan proses sains telah dilaksanakan kepada guru IPA SMA Negeri 2 Tanjung Jabung Barat. Tujuan dari pelatihan ini adalah untuk meningkatkan kompetensi guru dalam mengembangkan instrumen penilaian berpikir kritis yang terintegrasi dengan keterampilan proses sains. Metode yang digunakan dalam pelatihan adalah model pendampingan berupa presentasi, diskusi dan pendampingan pengembangan instrument penilaian. Pre- test dan post- test dilakukan untuk mengukur peningkatan pemahaman konsep dan keterampilan praktis guru. Hasil analisis menunjukkan bahwa adanya peningkatan dengan nilai N- Gain sebesar 0.85 yang menunjukkan efektivitas pelatihan sebesar 85%. Hasil tersebut menunjukkan bahwa pelatihan pengembangan instrumen penilaian telah berhasil meningkatkan pemahaman konsep dan keterampilan guru. Dengan demikian, pelatihan ini diharapkan dapat tidak hanya memperoleh pemahaman teoretis, tetapi juga keterampilan praktis dalam Menyusun, mengimplementasikan, dan mengevaluasi instrumen penilaian yang lebih bermakna
Co-Authors AJ, Suharli Bella Arisha Fiki Alghadari Kriswantoro Kriswantoro M Furqon Nurul Hidayah Rahma Dani Saparuddin Saparuddin