Özet:

The concept of slope is one of the prerequisites of some topics in mathematics. Prerequisites are thought as important for conceptualization of mathematical concepts. The aim of this study is to reveal conceptual knowledge of mathematics teacher-candidates about the concept of slope. The study is conducted with the teacher-candidatesstudying at the Department of Mathematics Education in a state university in Turkey. Conceptual definitions and perceptions of the teacher-candidates about the concept were investigated and evaluated in terms of grade level. When obtained data was examined, it appeared that the teacher-candidates explained the concept with geometrical approach mostly and their knowledge level about the concept of slope differed in terms of grade level. In higher grade levels, it was found that use of trigonometrical approach increased while that of physical approach decreased

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