Adding and Subtracting Signed Integers on a Number Line

This example demonstrates how adding and subtracting signed integers can be visualized directly on a number line using directional steps (optionally linked to vector displacement). The key ideas are signed numbers, the rule for integer addition/subtraction with positive and negative directions, and the correspondence between a number’s coordinate on the axis and the direction/magnitude of movement. Construction-wise, the setup is built with GeoGebra commands Point to create key positions on the number line, Vector to represent the directed change from one value to another, and Text to label the numbers and results (e.g., sum and diff). Labeled objects and computed expressions (such as the displayed total and difference) make the operation-to-movement relationship explicit. Suitable for middle school through early high school students, as a clear visualization for learning signed-integer arithmetic and strengthening number-line reasoning.