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All Journal Jurnal Karya Pendidikan Matematika
Sitanggang, Mastri Angely
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Education Mathematics

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Analysis of Students’ Errors in Solving Probability Problems Based on Kastolan’s Theory of Error Classification at Wesley Private Junior High School Sitanggang, Mastri Angely; Azzahra, Najwa; Simarmata, Sevrianna; Simamora, Tiara Rezeki; Nathania, Gavrila; ., Kairuddin
Jurnal Karya Pendidikan Matematika Vol 13, No 1 (2026): Jurnal Karya Pendidikan Matematika Volume 13 Nomor 1 Tahun 2026
Publisher : Universitas Muhammadiyah Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26714/jkpm.13.1.2026.123-133

Abstract

This study aims to analyze student errors in solving probability problems based on the classification of errors according to Kastolan's theory, which includes conceptual, procedural, and technical errors. This study used a qualitative, descriptive approach. The subjects were 25 ninth-grade students at Wesley Private Junior High School who had studied probability. Data collection techniques were conducted through written tests and interviews. Data were analyzed through data reduction, data presentation, and conclusion drawing. The results showed that students still make various errors in solving probability problems, including errors in understanding basic concepts, inaccuracies in formulating solution steps, and calculation errors. Conceptual errors occur due to a lack of understanding of the definition and formula of probability, procedural errors are caused by a lack of systematic solution steps, while technical errors are caused by a lack of accuracy in calculations. These findings indicate that students' understanding of probability still needs to be improved. Therefore, more effective learning strategies are needed to minimize student errors in solving probability problems.
Co-Authors Azzahra, Najwa Kairuddin . Nathania, Gavrila Simamora, Tiara Rezeki Simarmata, Sevrianna