Multiplying Integers: Visualizing the Rule of Signs

① This applet dynamically demonstrates the rule of signs in integer multiplication, showing how the product's sign depends on the signs of the factors (positive × positive = positive, positive × negative = negative, etc.). ② The core mathematical concept is integer multiplication with signed numbers, emphasizing the sign rules and the relationship between factors and product. ③ Construction highlights: Based on the summary, the applet uses GeoGebra commands such as Arc, If, and Sequence, along with multiple points (A, B, C, D, etc.) and lists (lista1, lista3). Text objects (texto1, texto2, texto3) display the multiplication expression and result dynamically. Objects like facerightstepback and facerightstepforward suggest step-by-step animations that visually illustrate the sign changes. ④ This is suitable for upper elementary to middle school students, serving as an interactive visual aid for teachers or for self-directed learning, helping learners grasp the abstract rule of signs through concrete visual feedback.