This math topic focuses on using the Cartesian grid to solve for the missing dimensions of rectangles given their perimeters. It covers skills such as calculating the missing width or height when the perimeter and the other dimension are known. It emphasizes only positive dimensions and uses various perimeters like 24, 22, 20, and 18, while the given dimensions range from 1 to 6. The task challenges students to apply understanding of the relationship between perimeter and the dimensions of rectangles, showcasing an introduction to Cartesian grid geometry and logical reasoning skills.