This math topic focuses on measuring the length of line segments on a grid, forming a basic introduction to understanding perimeter concepts. Each problem presents a grid of 1x1 squares where the students are tasked with identifying lines of specific lengths, such as 6, 7, 8, 9, or 10 units. These exercises help in developing spatial awareness and the ability to calculate linear dimensions visually and numerically, which is foundational for further geometrical studies.