This study aims to analyse the skills to understand mathematical concepts in the Probability Theory subject. As a scientific discipline, Probability Theory is one of the statistics study program subjects that require mathematical skills to learn. One of the skills needed for learning is the skill of understanding mathematical concepts. The analysis of skills in understanding mathematical concepts in the Probability Theory course shows that students still have difficulty checking the truth and

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... iting the concepts used in each discussion of the material. This is one of the factors that make students' skills to understand mathematical concepts not good. Based on this research, it appears that students' mathematical understanding skills in the Probability Theory course are still lacking. Understanding the concept of statistics is not currently apparent in students when studying the Probability Theory. They have not been able to optimize all their mathematical abilities in learning, so they tend to give up on doing tasks when experiencing difficulties. This research is expected to be a reference and discourse for practitioners of mathematics education to improve the ability to understand the basic concepts of Probability Theory.