This math topic focuses on identifying x-coordinates on a Cartesian grid. Students are given multiple questions where they must determine the x-values of points plotted on Cartesian grids without any directional indicators. Each problem sets multiple points for which a student needs to identify the correct x-coordinate from the visuals provided. This exercise is part of the broader unit on Cartesian Grid Foundations, aimed at enhancing students' understanding of Cartesian plotting and coordinate identification.