DEVELOPMENT OF PADI PROPS (COMPARISON BOARD) TO IMPROVE CONCEPT UNDERSTANDING OF JUNIOR HIGH SCHOOL STUDENTS

Students' understanding of mathematical concepts in junior high school, particularly in the topic of ratios, is still relatively low because they have difficulty visualizing the relationships between values. Therefore, a teaching aid is needed to help facilitate the understanding of this concept. The purpose of this study is to determine the validity, effectiveness, and practicality of the development of the PADI (Comparison Board) teaching aid in enhancing the conceptual understanding of junior high school students with the assistance of Quizizz. This research follows the R&D approach using the 4D model. This study involved 27 students of class VIIE. This study employed validation questionnaires, response questionnaires, and tests as research instruments. The researcher used three data analysis techniques: validity, effectiveness, and practicality of the teaching aid. The results of this study are based on the average validation score from three experts, which was 85.91%, categorized as "Valid." The students' test results showed a classical completeness score of 85.18% of the total number of students, categorized as "Effective." The student and teacher response questionnaires yielded percentages of 88.14% and 100%, respectively, falling into the "Practical" category. The development of the PADI teaching aid has proven to help students understand the concept of ratios in a concrete and enjoyable way. In addition, the use of validated teaching aids supported by technology such as Quizizz can be an innovative alternative to improving the quality of mathematics learning in schools. Pemahaman konsep matematika siswa SMP pada materi perbandingan masih tergolong rendah karena siswa mengalami kesulitan dalam memvisualisasikan hubungan antar nilai. Oleh karena itu, dibutuhkan alat peraga yang dapat membantu mempermudah pemahaman konsep tersebut. Tujuan dari penelitian ini adalah untuk mengetahui kevalidan, keefektifan, dan kepraktisan dari pengembangan alat peraga PADI (Papan Perbandingan) dalam meningkatkan pemahaman konsep siswa SMP dengan bantuan Quizizz. Penelitian ini termasuk R&D dengan menggunakan model 4D. Penelitian ini melibatkan 27 siswa kelas VIIE. Penelitian ini menggunakan angket validasi, angket respon, dan tes sebagai instrumen penelitian. Peneliti menggunakan tiga teknik analisis data, yaitu kevalidan, keefektifan dan kepraktisan dari alat peraga. Hasil penelitian ini didasarkan pada rata-rata skor validasi ketiga ahli, yakni 85,91%, termasuk dalam kategori "Valid". Hasil tes peserta didik didapatkan skor ketuntasan klasikal sebesar 85,18% dari total jumlah peserta didik, yang dikategorikan "Efektif.” Hasil angket respon peserta didik dan pendidik diperoleh persentase 88,14% dan 100% termasuk dalam kategori "Praktis". Pengembangan alat peraga PADI terbukti dapat membantu siswa memahami konsep perbandingan secara konkret dan menyenangkan. Selain itu, penggunaan alat peraga yang divalidasi dan didukung teknologi seperti Quizizz dapat menjadi alternatif inovatif dalam meningkatkan kualitas pembelajaran matematika di sekolah.