Pirie & Kieren (1994b) states that conceptual understanding in human beings is divided into eight levels. This qualitative and descriptive research study aims to identify the layers of conceptual understanding of fractions through three representations, namely of circles, rectangles, and number lines. The subjects of this research are three sixth-grade students from SD Batu Malang. The instruments of this research are an essay test consisting of 12 questions and a semistructured interview. The essay test is adopted from Tunç-Pekkan (2015) and test the fractional analysis of a circle representation, rectangle-representation, and number line representation with four questions provided for each representation. The data analysis of this research uses the resource triangulation technique. Based on the work done by the students, the results show that in terms of layers of conceptual understanding, Subject 1 demonstrated understanding layers from Primitive Knowing (Pk) through Property Noticing (Pn), Subject 2 demonstrated understanding layers from Image Making (Im) through Property Noticing (Pn); and Subject 3 demonstrated understanding layers from Image Making (Im) through Formalizing (F).