Abstract: Drawing and interpreting graphs, and making prediction from graphs, are Important skills in the mathematics curriculum. They are also essential components of statistical literacy in today’s society. Students need to be able to interpret a graph in a authentic context, and identify any misleading features. Responses to questions about a graph-based advertisement suggest that students have difficulties in tasks such as comprehending the relevance of a graph in the context of a standard interpretation task, and applying calculation skills which have been learned in other contexts to data in graphical representations. In this report data from 37 Primary 6 Singapore students are discussed.