This math topic focuses on understanding and calculating the perimeter of rectangles presented on a 1x1 grid. Each question presents two rectangles, whereby students must determine which of the two has the longest perimeter. This enrichment activity is part of an introductory unit on perimeter, aimed at helping students visualize perimeter on a grid and enhance their ability to compare lengths. The activity presents images of rectangles and requires students to evaluate the perimeter based on the grid's scale.