Representing Small Numbers on a Number Line with Reflections

This example demonstrates how to represent and locate small decimal numbers on the number line using geometric constructions. It emphasizes visually mapping decimal values (including numbers less than 1) to corresponding points on the line, using reflection/mirroring as a reference mechanism to make the magnitude and sign clearer. Key concepts include number-line representations, coordinate meaning with positive/negative values, decimal as a partitioned scale, and the role of geometric transformations—especially reflections—in positioning coordinates. The construction is driven by GeoGebra input and labeling tools: numerous Textfield/InputBox controls (e.g., InputBox3–InputBox20 and text3–text17) allow students to input values and display intermediate annotations, while predefined labeled objects (such as points A, B, C, D and additional items like E, F, pic1) provide the geometric references used to place the decimal points. Suitable for middle school learners and math instruction when introducing or practicing decimal reading/writing and number-line reasoning.