Jeliana Intan Permata, Mega Teguh Budiarto, Yusuf Fuad
Mathematical modeling becomes an important factor that supports middle students' competence in solving problems related to daily life. However, a mathematical modeling instrument related to students' daily activities has not been widely developed. This research develops a validated instrument of mathematics modeling for middle school students based on the existence of local culture. The proposed instrument was tried out on both public and private middle schools in Landak Regency, i.e., the VIIIB class of public schools with 30 students and the VIA class of private schools with 28 students. The instrument is validated by three associate professors and one master's degree of mathematics teacher who are in mathematics education. The content validity value is > 0.83. The readability and feasibility of its instrument are carried out by one mathematics teacher and two students from a different private middle school. Furthermore, all 58 students had to answer all the questions in 90 minutes. The results are grouped, namely, eight students with high ability (score ≥ 80), 15 students with medium, and 35 students with low ability (score < 65). Furthermore, the instrument has x = 58.98, σ = 21.67, the construct validity value is 0.258, the reliability value is 0.725, the difficulty level is 0.4903 (medium), and the discriminating power test is 0.625 (good). It is therefore concluded that the proposed instrument satisfies content validity, construct validity, and reliability. Thus, the instrument is valid and reliable and could be implemented in other middle school students to examine their mathematical modeling competency. © 2025 Author(s).
Mathematics Education Study Program, Universitas Negeri Surabaya, Surabaya, Indonesia
