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Students of mathematics education (prospective teachers) often experience constraints when understanding math problems. One of the mistakes that students often encounter is the mistake of constructing mathematical concepts. This results in an error when students solve math problems. This sort of mistake should not happen for a math student who later becomes a math teacher. Researchers want to reveal in order to get a picture of errors mengontruksi concept in overcoming the problems experienced by the student. Therefore it is necessary knowledge of mathematical reasoning structure of student in solving math problem. Based on the problems and objectives of the study, this type of research is descriptive qualitative, which aims to describe the mathematical reasoning structure of students when solving math problems. The results of the study found descriptions (1) students' mathematical reasoning that is connective, (2) inductive mathematical reasoning, and (3) deductive mathematical reasoning

Reasoning structures, mathematical problems, connective reasoning, inductive reasoning, and deductive reasoning.