Islamiyah, Aris Mislikhatun
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Development and Validation of A Self-Confidence Measurement Instrument In Mathematics Learning Using The Rasch Model Dewanti, Sintha Sih; Ashabulabib, Adib; Dewi, Indriana Puspita; Islamiyah, Aris Mislikhatun
Mathline : Jurnal Matematika dan Pendidikan Matematika Vol. 10 No. 1 (2025): Mathline : Jurnal Matematika dan Pendidikan Matematika
Publisher : Universitas Wiralodra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31943/mathline.v10i1.697

Abstract

Self-confidence is a critical factor in mathematics learning, influencing students' engagement and performance. However, studies show that Indonesian students often lack confidence in mathematics subject, hindering their academic potential. Accurate instruments are needed to measure and address this issue effectively. This tudy aims to develop a self-confidence measurement instrument for mathematics learning among secondary school students. The instrument comprises 25 statements categorized into four main aspects. The research employs a descriptive quantitative method with the Rasch Model approach and utilizes exploratory and confirmatory factor analysis. The sample consists of 122 randomly selected tenth-grade students in Yogyakarta. The results indicate that the developed instrument has high validity, with an Aiken's V coefficient of 0.99, and very high reliability, evidenced by a Cronbach's Alpha coefficient of 0.845 with a total of 18 items used. Factor analysis shows that the items in the self-confidence questionnaire meet the unidimensionality requirement, although some items need correction to enhance measurement accuracy for one self-confidence indicator. Overall, this instrument provides a valid and reliable tool for measuring students' self-confidence in mathematics learning, potentially contributing to the enhancement of students' confidence in this subject. So that, 18 statements are more efficient to use, without reducing the scope of the self-confident aspect being measured. The results allow the use of instruments for various levels of education and support the implementation of more personalized learning strategies.
Implementation of Lesson Study by Dominating Discovery Learning and TGT Models to Increase Student Learning Interest Islamiyah, Aris Mislikhatun; Suparni, Suparni; Azka, Raekha; Hayati, Siti Rahmatun
JPMI (Jurnal Pendidikan Matematika Indonesia) Vol 10, No 2 (2025): Volume 10 Number 2, September 2025
Publisher : STKIP Singkawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26737/jpmi.v10i2.6445

Abstract

This study aims to improve students' interest in learning This study aims to increase students' interest in learning mathematics by implementing Lesson Study that combines Discovery Learning and Teams Games Tournament (TGT) models. The method used in this research is descriptive qualitative, which was conducted on students of class XE MAN 4 Sleman for the academic year 2024/2025. Data were obtained through questionnaires, observation, and documentation. The research was conducted in two cycles which included planning, implementation, and reflection stages. The results showed a significant increase in students' interest in learning. At the end of Cycle I, only 18.18% of students showed very high interest in learning, while at the end of Cycle II, the percentage increased to 51.51%. This increase shows the effectiveness of applying a combination of Discovery Learning and TGT models in increasing students' interest in learning mathematics. In Cycle I, various obstacles were still found, such as low student participation, teacher dominance in learning, and learning outcomes that had not reached the KKM target. Therefore, Cycle II planning focused on empowering student involvement through interesting and collaborative media. After making improvements in Cycle II, there was a significant increase in both student interest and involvement, as well as the achievement of the research success indicators. Thus, the research was stopped at Cycle II because the objectives had been achieved, and Lesson Study can be concluded as an effective strategy to increase students' interest in learning.Penerapan Lesson Study Dengan Mendominasi Model Discovery Learning Dan TGT Untuk Meningkatkan Minat Belajar SiswaABSTRAKPenelitian ini bertujuan untuk meningkatkan minat belajar matematika siswa dengan menerapkan Lesson Study yang menggabungkan model Discovery Learning dan Teams Games Tournament (TGT). Metode yang digunakan dalam penelitian ini adalah deskriptif kualitatif, yang dilaksanakan pada siswa kelas XE MAN 4 Sleman untuk tahun ajaran 2024/2025. Data diperoleh melalui angket, observasi, dan dokumentasi. Penelitian dilakukan dalam dua siklus yang mencakup tahap perencanaan, pelaksanaan, dan refleksi. Hasil penelitian menunjukkan peningkatan yang signifikan dalam minat belajar siswa. Pada akhir Siklus I, hanya 18,18% siswa yang menunjukkan minat belajar sangat tinggi, sedangkan pada akhir Siklus II, persentase tersebut meningkat menjadi 51,51%. Peningkatan ini menunjukkan efektivitas penerapan kombinasi model Discovery Learning dan TGT dalam meningkatkan minat siswa terhadap pembelajaran matematika. Pada Siklus I, masih ditemukan berbagai kendala, seperti rendahnya partisipasi siswa, dominasi guru dalam pembelajaran, serta hasil belajar yang belum mencapai target KKM. Oleh karena itu, perencanaan Siklus II difokuskan pada pemberdayaan keterlibatan siswa melalui media yang menarik dan kolaboratif. Setelah dilakukan perbaikan pada Siklus II, terjadi peningkatan yang signifikan baik dari segi minat maupun keterlibatan siswa, serta tercapainya indikator keberhasilan penelitian. Dengan demikian, penelitian dihentikan pada Siklus II karena tujuan telah tercapai, dan Lesson Study dapat disimpulkan sebagai strategi yang efektif untuk meningkatkan minat belajar siswa.Kata Kunci:Pendidikan; Lesson study; minat belajar