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All Journal Kognitif: Jurnal Riset HOTS Pendidikan Matematika
Ani Nur Aeni
Elementary School Teacher Education Program, Sumedang Regional Campus, Universitas Pendidikan Indonesia
Computer Science & IT Education Library & Information Science Mathematics Social Sciences Other

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Effect of Problem-Based Learning Approach Assisted by GEO-KODE on Understanding the Mathematical Concepts of Composition and Decomposition of Plane Shapes Gina Dwi Arista; Isrok'atun Isrok'atun; Ani Nur Aeni
Kognitif: Jurnal Riset HOTS Pendidikan Matematika Vol. 6 No. 3 (2026): July - September 2026
Publisher : Education and Talent Development Center Indonesia (ETDC Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/kognitif.v6i3.5358

Abstract

Abstract Students’ limited understanding of mathematical concepts may hinder their ability to solve problems requiring analysis of relationships among concepts. This study examined the effectiveness of Problem-Based Learning (PBL) supported by GEO-KODE (Geometry-Composition Decomposition), an interactive learning medium designed to help students visualize the composition and decomposition of plane figures. A quantitative quasi-experimental method with a nonequivalent control group design was employed. The participants were 61 fourth-grade students selected through purposive sampling. The experimental group consisted of 31 students from Cijambe II Public Elementary School, while the control group included 30 students from Sukamulya Public Elementary School. Data were collected using a mathematical concept understanding test consisting of 15 valid items with high reliability. Data analysis included tests of normality, differences in mean scores, and normalized gain (N-Gain). The experimental group’s mean score increased from 31.55 on the pretest to 74.97 on the posttest, whereas the control group’s mean score increased from 38.83 to 51.77. A significant difference in posttest performance was found between the two groups (p < .001). The N-Gain analysis also showed a significant difference in improvement between the experimental and control groups (p < .001). These findings indicate that students who learned through PBL supported by GEO-KODE demonstrated greater improvement in mathematical concept understanding than those who received conventional instruction. The results suggest that integrating problem-based activities with interactive visual media can support fourth-grade students in understanding the composition and decomposition of plane figures, particularly by making relationships among component shapes more explicit during classroom problem solving.
Effect of The RME Approach Assisted by the Change-It! Media on Students' Mathematical Representation Abilities Wulandari Wulandari; Isrok&#039;atun Isrok&#039;atun; Ani Nur Aeni
Kognitif: Jurnal Riset HOTS Pendidikan Matematika Vol. 6 No. 3 (2026): July - September 2026
Publisher : Education and Talent Development Center Indonesia (ETDC Indonesia)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51574/kognitif.v6i3.5359

Abstract

This study aims to analyze the effect of the RME approach assisted by Change-It! media on the mathematical representation ability of fourth-grade students. The RME approach was chosen because it provides opportunities for students to build their own mathematical understanding through situations close to their lives, while the Change-It! media is used to help students transform concrete data into various forms of representation. This study uses a quantitative and quasi-experimental approach as its research method. The design used is a nonequivalent control group design and the sampling technique used is purposive sampling. The population in this study were all fourth-grade students in Cimalaka District with the selected samples being Mandalaherang I Elementary School as the experimental class and Cimalaka III Elementary School as the control class. The instrument used was a mathematical representation ability test. The results of this study are that the RME approach assisted by Change-It! media has a significant effect on the mathematical representation ability of fourth-grade students.This is proven by the results of statistical data tests,The average final mathematical representation ability of students after being given the Change-It! media-assisted RME approach was 69.74 with an N-Gain value of 0.55, which is included in the medium category of improvement and the effect of the Change-It! media-assisted RME approach on mathematical representation ability is 54.76%. Meanwhile, the average final mathematical representation ability of students after being given the conventional approach was 48.95 with an N-Gain value of 0.27, which is included in the low category of improvement and the effect of the conventional approach on students' mathematical representation ability is 78%. It is concluded that there is a difference in the influence between the Change-It! media-assisted RME approach and the conventional approach on the mathematical representation ability of fourth-grade students on pictogram material.
Co-Authors Gina Dwi Arista Isrok&#039;atun Isrok&#039;atun Wulandari Wulandari