This math topic focuses on understanding the meanings of coordinates on the Cartesian grid, specifically the Y coordinate, in various contexts without the use of a visible grid. The problems, designed for practice at level 2, entail interpreting the value of a coordinate in a point's description and determining whether it pertains to the x or y value. The questions are structured as multiple choice, and each one presents a single coordinate value asking students to select the correct meaning of that value. Overall, the skills emphasized include comprehension of coordinate values and their application in identifying point locations in a Cartesian plane.