This math topic focuses on measuring the length of a line on a 1x1 square grid. Each problem involves a visual representation where students must determine the length of a line segment accurately using the grid. The problems are a part of an introductory unit on the concept of perimeter, aiming to develop spatial awareness and measurement skills in a grid format. Students are provided with multiple-choice answers for each line measurement task. This set of exercises is designed to enhance understanding of basic geometry concepts and applying them in practical scenarios.