Development of Worksheets Based on Realistic Mathematics Education to Enhance Junior High School Students’ Mathematical Communication Skills

Abstract

Abstrak

Penelitian ini bertujuan untuk mengembangkan Lembar Kerja Peserta Didik (LKPD) berbasis Realistic Mathematics Education (RME) guna meningkatkan kemampuan komunikasi matematis siswa. Permasalahan yang diangkat adalah rendahnya kemampuan komunikasi matematis siswa yang teridentifikasi dari hasil observasi awal, di mana lebih dari 60% siswa mengalami kesulitan menyampaikan ide atau menjelaskan proses penyelesaian masalah secara matematis. Model pengembangan yang digunakan adalah ADDIE (Analysis, Design, Development, Implementation, Evaluation) karena memungkinkan perencanaan terstruktur, validasi ahli, serta evaluasi efektivitas produk. Subjek penelitian terdiri atas 28 siswa kelas VIII di salah satu SMP di Provinsi Lampung. Instrumen yang digunakan meliputi lembar validasi ahli, angket respon siswa, dan tes kemampuan komunikasi matematis. LKPD yang dikembangkan divalidasi oleh dua ahli dan memperoleh skor rata-rata 87%, yang menunjukkan kategori “sangat valid”. Respon siswa terhadap LKPD juga sangat positif dengan skor rata-rata 85%. Efektivitas LKPD diuji melalui hasil pretest dan posttest, menunjukkan peningkatan skor rata-rata dari 52 menjadi 78 dengan N-Gain sebesar 0,65 dalam kategori sedang, serta hasil uji-t menunjukkan peningkatan signifikan. Hasil penelitian ini menunjukkan bahwa LKPD berbasis RME yang dikembangkan efektif dan layak digunakan untuk meningkatkan kemampuan komunikasi matematis siswa.

Abstract

This research aims to develop Student Worksheets (LKPD) based on Realistic Mathematics Education (RME) to enhance students’ mathematical communication skills. The research problem addressed is the low level of students’ mathematical communication, as identified through preliminary observations where more than 60% of students struggled to express ideas or explain problem-solving processes mathematically. The development model used is ADDIE (Analysis, Design, Development, Implementation, Evaluation), as it allows for structured planning, expert validation, and product effectiveness evaluation. The research subjects consisted of 28 eighth-grade students at a junior high school in Lampung Province. The instruments used included expert validation sheets, student response questionnaires, and mathematical communication tests. The developed LKPD was validated by two experts and received an average score of 87%, indicating a “very valid” category. Student responses were also highly positive, with an average score of 85%. The LKPD’s effectiveness was evaluated using pretest and posttest results, showing an average score increase from 52 to 78 with an N-Gain of 0.65, categorized as moderate, and the t-test results indicated a statistically significant improvement. These findings demonstrate that the RME-based LKPD developed is effective and feasible to use in improving students’ mathematical communication skills.