Multiplying Integers on a Number Line: Visualizing the Sign Rule

This GeoGebra applet dynamically demonstrates integer multiplication on a number line, helping students intuitively grasp the sign rule for multiplying positive and negative numbers. The core mathematical concept is integer multiplication, represented through direction and distance on the number line, along with the rule that like signs yield positive products and unlike signs yield negative products. The construction uses GeoGebra commands such as Arc, If, and Sequence to create dynamic points and segments on the number line, with objects including A, a, b, c, lista3, lista1, B, d, and text labels texto1 through texto4 that display the multiplicands, product, and sign explanations. This resource is ideal for middle school mathematics classrooms or self-study, helping students overcome the abstract challenge of sign rules, and also serves as a reference for teachers creating interactive lessons.