Visualizing Subtraction: Segment Difference and Coordinate Demonstration

① This GeoGebra example dynamically illustrates the geometric meaning of subtraction by showing the length difference between line segments on a number line, making the result of subtracting two numbers visually intuitive. ② Core mathematical concepts include subtraction, real number coordinates, segment length, and combinatorial counting, bridging abstract arithmetic with concrete geometric construction. ③ Construction highlights: Random command generates random numbers, If condition controls object visibility, Segment constructs segments representing the minuend and subtrahend, OrthogonalLine and Intersect create perpendicular auxiliary lines and intersection points, Point and Line define key points and lines, and multiple text objects (text1 to text8) dynamically display numerical values and the operation process, with button1 triggering random updates. ④ Suitable for upper elementary to middle school students to grasp subtraction concepts, and for teachers to demonstrate in class, fostering number-and-shape integration thinking, while also serving as a visual aid for combinatorial counting problems.