Analisis Deskriptif Peningkatan Kemampuan Dekomposisi Bangun Datar melalui Media Tangram pada Siswa Kelas II SD Negeri Sleman 4

Abstract

This study aims to describe the 2D shape decomposition ability of second-grape student at SD Negeri Sleman 4 before and after learning with Tangram media, as well as to describe the level of improvement in that ability. This study utilized a descriptive quantitative approach. The subjects consisted of 21 second-grade students who completed the entire series of activities, including the pre-test, Tangram-assisted learning sessions, and post-test. Data collection was carried out using testing techniques via pre-test and post-test. Data were analyzed descriptively using mean, minimum, and maximum scores, followed by gain analysis using the N-Gain Score. The results show that the mean score of students’ 2D shape decomposition ability increased significantly from 56,90 on the pre-test to 87,14 on the post-test. The N-Gain Score analysis yielded an average of 0,73, categorized as high, with 11 students in the high category, 9 students in the medium category, and 1 student in the low category. In addition to the improvement in decomposition ability, students also demonstrated the ability to perform shape composition through direct exploration activities during the learning process. Based on the findings, it can be concluded that the use of Tangram media yields positive and effective results in echancing school students’ 2D shape decomposition abilities