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All Journal Jurnal Absis : Jurnal Pendidikan Matematika dan Matematika
Pentatito Gunowibowo
Universitas Lampung, Indonesia
Mathematics

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The effect of the guided discovery learning model on students' mathematical reasoning ability Reni Auliana Amri; Pentatito Gunowibowo; Agung Putra Wijaya
Jurnal Absis: Jurnal Pendidikan Matematika dan Matematika Vol. 8 No. 2 (2025): Jurnal Absis
Publisher : Program Studi Pendidikan Matematika Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30606/absis.v8i2.3249

Abstract

This quasi-experimental study aimed to investigate the effect of the Guided Discovery Learning (GDL) model on the mathematical reasoning ability of eighth-grade students. The population consisted of 319 students from Grade VIII at SMP Negeri 20 Bandar Lampung during the 2024/2025 academic year, distributed across ten classes (VIII-A to VIII-J). Using a purposive sampling technique, two classes were selected as research samples: class VIII-B (32 students) as the experimental group, which received instruction using the GDL model, and class VIII-A (32 students) as the control group, which received conventional cooperative learning. The study employed a pretest-posttest control group design. The research data were quantitative, obtained through a mathematical reasoning ability test on the topic of Systems of Linear Equations in Two Variables, administered before and after the intervention in both groups. Statistical analysis using an independent samples t-test on the gain scores revealed a statistically significant difference. The findings showed that students in the GDL group experienced greater improvement in mathematical reasoning ability compared to those in the control group. These results suggest that the GDL model has a positive and significant effect on enhancing students' mathematical reasoning skills.
The effect of the guided inquiry learning model on the improvement of students’ mathematical problem-solving ability Benazir Shafa Imani; Pentatito Gunowibowo; Santy Setiawati
Jurnal Absis: Jurnal Pendidikan Matematika dan Matematika Vol. 9 No. 2 (2026): Jurnal Absis
Publisher : Program Studi Pendidikan Matematika Universitas Pasir Pengaraian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30606/absis.v9i2.4473

Abstract

Students’ mathematical problem-solving ability remains relatively low, as reflected in their difficulties in understanding problems, connecting relevant concepts, and evaluating and drawing conclusions from their solutions. This study investigated the effect of the guided inquiry learning model on the improvement of students’ mathematical problem-solving ability. A quasi-experimental method with a pretest-posttest control group design was employed. The population comprised 252 eighth-grade students at SMP Negeri 9 Bandar Lampung. Through purposive sampling, 26 students from class VIII-E were selected as the experimental group, while 28 students from class VIII-C were selected as the control group. Data were collected using a mathematical problem-solving ability test and analyzed using the Mann-Whitney U test. The results showed that students who participated in guided inquiry learning achieved greater improvement in mathematical problem-solving ability than those who participated in conventional learning. These findings demonstrate that the guided inquiry learning model has a significant effect on improving students’ mathematical problem-solving ability.
Co-Authors Agung Putra Wijaya Benazir Shafa Imani Reni Auliana Amri Santy Setiawati