Visualizing Addition and Subtraction of Negative Numbers on a Number Line by azb

① This GeoGebra example demonstrates how to add and subtract negative numbers using a dynamic number line, making the abstract rules of sign operations visually intuitive. ② Core mathematical concepts include negative number arithmetic, number line direction and distance, additive inverses, and sign determination of results. ③ Construction highlights: uses commands such as CircleArc, Line, Mirror, Arc, and Sequence to build the number line and directional arrows; objects like A, B, C, D, E mark key points, while text objects display the operation and result, and lists (list1, list2) control step-by-step animation. ④ Suitable for middle school mathematics lessons on negative numbers, also useful for elementary enrichment or high school review, as an interactive classroom demonstration or self-study tool.