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All Journal KALAMATIKA Jurnal Pendidikan Matematika Pi Radian Journal
Marlina, Ratna
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Education Mathematics

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Problem based learning with geogebra software on self confidence of junior high school students Marlina, Ratna
Pi Radian: Journal of Mathematics Education Vol. 1 No. 2 (2023): Pi Radian Journal
Publisher : CV. Pustaka Literasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63214/piradian.v1i2.pp65-72

Abstract

This research is motivated by the low level of confidence of junior high school students, so it is necessary to design learning that overcomes these problems. One of the alternative solutions is using problem-based learning approach with the help of GeoGebra software. In the process, this research uses an experimental design, where there is an experimental class that uses a problem-based learning approach and a control class using the usual approach. The population in this study were junior high school students in Cimahi city while the sample was in one of the junior high schools in Cimahi city. Data collection techniques using non-test instruments in the form of self-confidence questionnaire as many as 25 questions. Data processing techniques using two mean difference test. The results showed a significant 0.490 > 0.05. which means that there is no difference in mathematical self-confidence of junior high school students using a problem-based learning approach assisted by geogebra with those who learn using ordinary learning. This happens because of several factors such as time and learning environment that is less conducive, the use of methods, students such as lack of enthusiasm and concentration.
Exploring 11th-grade students’ mathematical reasoning ability on sequences and series: A qualitative study Faridah, Nurul; Marlina, Ratna
Pi Radian: Journal of Mathematics Education Vol. 3 No. 1 (2025): Pi Radian Journal
Publisher : CV. Pustaka Literasi Ilmiah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.63214/piradian.v3i1.pp17-32

Abstract

This study aims to provide an analytical description of how students solve five essay questions aligned with indicators of mathematical reasoning ability. A descriptive qualitative method was employed, with a purposive sample of seven 11th-grade high school students in West Bandung Regency. Data were collected through students’ written responses to test instruments and subsequently analyzed to identify errors in the problem-solving process and to measure mathematical reasoning skills. The measured indicators included: (1) formulating conjectures, (2) performing mathematical manipulations, (3) constructing evidence and providing justification for multiple solutions, (4) drawing conclusions from statements, and (5) verifying the validity of arguments. The findings show that indicator (1) reached the very good category with a percentage of 85.71%, while indicator (2) was categorized as good with 60.71%. Indicators (3) and (5) fell into the sufficient category with percentages of 32.14% and 46.43%, respectively. Indicator (4) was categorized as poor with 25.00%. Overall, the average percentage across all indicators was 50.00%, indicating that the mathematical reasoning ability of 11th-grade high school students in the school under study falls into the sufficient category. This study contributes to the existing body of knowledge by offering a detailed profile of students’ reasoning performance across multiple indicators, providing empirical evidence of specific reasoning weaknesses often overlooked in quantitative assessments, and highlighting the need for targeted instructional interventions to strengthen conceptual understanding and argumentation in mathematics learning.
Developing ethnomathematics-based interactive digital book to improve mathematical connections and self-confidence: The PMRI approach Marlina, Ratna; Hidayat, Wahyu; Supriatna, Tatang
KALAMATIKA Jurnal Pendidikan Matematika Vol 11 No 1 (2026): KALAMATIKA April 2026
Publisher : FKIP Universitas Muhammadiyah Prof. DR. HAMKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22236/KALAMATIKA.vol11no1.2026pp120-145

Abstract

One reason students have difficulty understanding the relationships among quadrilaterals, area, and perimeter is the lack of innovative teaching materials in schools. Therefore, this study aims to develop an interactive digital book using a valid, practical, and effective PMRI approach based on ethnomathematics to improve students' mathematical connection skills and self-confidence. The research method employed was Design Research of the development study type. The research subjects consisted of three subject matter experts, three language experts, and one media expert, as well as 64 students from an Islamic middle school in West Bandung, Indonesia. The students included three eighth-grade students for one-to-one testing, nine eighth-grade students for small-group testing, and 52 seventh-grade students for field testing. The research instruments included validation sheets for subject matter, media, and language experts; unstructured interviews; student response questionnaires; a self-confidence questionnaire consisting of 40 The results of the study indicate that the mean validation score from subject matter experts was 95% (highly valid), from language experts 98% (highly valid), and from media experts 95% (highly valid). Student responses reached 92% (highly practical). The post-test significance values for mathematical connection skills (0.000) and self-confidence (0.001) were both below 0.05, indicating that the developed digital book was effective in improving students’ mathematical connection skills and self-confidence compared to conventional learning. Additionally, students’ self-confidence was categorized as high.
Co-Authors Nurul Faridah, Nurul Supriatna, Tatang Wahyu Hidayat