This handwritten-style educational poster clearly explains the concept of scale factor using simple language and neat organization. It defines scale factor as the ratio of a new size to an original size and highlights key rules for enlargement, reduction, and no change. The poster includes a worked example showing how to calculate a scale factor, along with a labeled diagram demonstrating how shapes change in geometry when scaled. It also connects the concept to real-life applications, such as maps and models, using a sample ratio. The clean layout, color-coded notes, and easy-to-follow visuals make it ideal for classroom teaching or student reference.