Students require knowledge of fraction, arithmetic and integer to tell the time. The purpose of the current study is to discover the conceptual knowledge related to hours, how the students read the clock and use half and quarter concepts to read the time in Turkey. A qualitative research method with a case study approach was used for this research. The participants of the study consisted of 12 students studying at the third grade of a public school located in the west of Turkey. The data of the study were collected through semi-structured interviews. A form consisted nine questions was used in the interviews. The data were then analysed using content analysis. As the result of analysis, it was determined that the students used fraction knowledge, number of minute and absolute time while telling the time, but mostly for fraction knowledge and some students could not associate the knowledge in the subject of the fractions with the reading the clock. [This study was presented as an oral presentation at International Congress on Science and Education (ICSE-2018), Turkey.]