Integer Addition and Subtraction on a Number Line

① This GeoGebra example dynamically demonstrates integer addition and subtraction on a number line, using points, vectors, and text labels to visualize how positive and negative numbers combine or cancel. ② Core mathematical concepts include integer arithmetic, number line representation, vector direction and magnitude corresponding to signs and values, and midpoint symmetry. ③ Construction highlights: commands such as Point, Vector, and Midpoint create key points (A, B, C, D, E, F) and vectors (u, v, w), while text objects (text1–text4) display results in real time; the number line serves as the background, with sliders or inputs controlling values. ④ Suitable for upper elementary to middle school students learning integer operations, and useful for classroom demonstrations or self-paced exploration to reinforce the connection between numbers and geometric intuition.