Introduction
Representation received increased attention when it was added as a new process standard in the National Council of Teachers of Mathematics’ (NCTM) Principles and Standards for School Mathematics (2000). “The ways in which mathematical ideas are represented is fundamental to how people can understand and use those ideas” (National Council of Teachers of Mathematics, 2000, p. 67). Students use representations as tools to support their mathematical understandings. Teachers’ presentations and uses of representations in the context of teaching influence students’ knowledge of and uses of representations. This, in turn, is related to students’ mathematical achievement. Therefore, it is important to examine the nature of mathematical representations and their uses in mathematics instruction.