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The purpose of this study was to describe the characteristics of quantitative reasoning that students had in problem solving process.  The method of this research was exploratory research with a qualitative approach.  This study involved 125 junior high school students of grade VIII; students having moderate math skill were selected as subjects in the study.  The data were collected through assignment tests, and task-based interviews.  The results of this study indicated that, there were three characteristics of students' quantitative reasoning in solving problems, namely (1) subjects connected then generalized called relational transitions;  (2)  subjects linked in the form of verbal words called relational verbal transitions ;  and (3) functional thinking by making symbolic generalization.  The characteristics resulted can be used as the basis for developing students' thinking to learn algebra

quantitative reasoning, characteristics, generalization