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Journal : Jurnal Math-UMB.EDU

DEVELOPMENT OF ESSAY INSTRUMENT TO MEASURE MATHEMATICAL CONCEPTUAL UNDERSTANDING ON SIMILARITY AND CONGRUENCE: Banten, Indonesia Wahyu Utomo, Muhammad Faruq; Novaliyosi; Aan Hendrayana; Abdul Fatah
Jurnal Math-UMB.EDU Vol. 13 No. 2 (2026): MARCH
Publisher : Universitas Muhammadiyah Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36085/math-umb.edu.v13i2.8530

Abstract

This study aims to develop a valid and reliable essay test instrument to assess mathematical conceptual understanding in ninth-grade junior high school students, focusing on similarity and congruence. Employing a modified 4D model (Define, Design, Develop, Disseminate), the research involved designing a test blueprint based on seven conceptual understanding indicators, expert validation using the Content Validity Ratio (CVR), and field testing to evaluate construct validity, reliability, item difficulty, and discrimination indices. The results indicated that all test items were valid, achieved a high reliability coefficient (α = 0.83), and exhibited varied difficulty and discrimination levels meeting established criteria. Consequently, this instrument is capable of comprehensively measuring students' conceptual understanding and serves as an effective assessment tool in mathematics education. Keywords: Essay Instrument, Mathematical Conceptual Understanding, Similarity and Congruence.
Co-Authors -, Bella Damayanti Aan Subhan Pamungkas Abdul Fatah Achmad Hufad Agung Sutrisno Agustini, Desti Anugrah, Sendy Mohamad Anwar Mutaqin Ardayeni, Ektin Arini, Ririn Arlika Yuni Arta ASTRI SULASTRI, ASTRI Azkia, Alfia Badrul Kamal Bawadi, Sanggiti Cecep Anwar Hadi Firdos Santosa Danis, Hayati Nufus Dase Erwin Juansah Dian Wahyuni Dimas Adji Permana Dito, Samuel Benny Erwin Yuniyanto Etika Khaerunnisa Etika Khaerunnisa Firiyani, Afiyah Fransiska Desy Natalia Hutapea Goliah, Mafdurotul Hanafi, Muhammad Syadeli Hanafie, H. M. Syadeli Hary Prasetio Utomo Heni Pujiastuti Henny Setiani Hepsi Nindiasari Hilda Maulidiansy Ihsanudin Ihsanudin Ihsanudin Ila Rosmilawati Ilmiyati Rahayu, Ilmiyati Isna Rafianti Isti Rusdiyani, Isti Juana, Melda Kurnia, Gita Afiati LULUK ASMAWATI Mahfuud, Dhitamaulia Maman Fathurrohman, Maman Marjohan Marjohan Maulid, Ahmad Ihsanudin Maulida Nur Zahara Ningrum, Anindya Kirana Putri Novaliyosi Novaliyosi Novaliyosi Nulhakim, Lukman Nulhakin, Lukman Nurul Anriani Permana, Muhamad Jeni Pratiwi, Hanum Nanda Pristiwanti, Desi Resti Hendriyani Ria Sudiana, Ria Rochani Rochani Saputra, Reksa Shintawati shintawati, shintawati Silvia Dian Nabela Siregar, Indah Lastari Suherman Sukirwan Sukirwan Suroso Mukti Leksono Suryana, Karjono Susilowati, Sumaryani Rita Syamsuri Syamsuri Syamsuri Syarifudin, Robihatul Hayatid Daraini Totok V.D. Saputro Wahyu Utomo, Muhammad Faruq Waluyo, Bambang Suhardi Waluyo, Binsar Wijaya, Ariska Juwita Yani Setiani, Yani Yasin, Muhamad Yayat Ruhiat Yuda, Erlangga Kusuma Yuyu Yuhana Yuyu Yuhana, Yuyu Zubaida, Ida