Multi-digit Subtraction Demo with Geometric Construction

① This example visualizes multi‑digit subtraction and links it to geometric figures such as triangles and prisms to illustrate area and sine relationships. ② Core concepts include multi‑digit subtraction arithmetic, the sine function, triangle area formula, and solid‑geometry properties of prisms (volume and surface area). ③ Construction highlights: RemoveUndefined clears undefined objects, RandomElement picks random elements, Vector creates vectors; numerous points (A, B, C …), image objects (bilde1‑bilde11), and lists (Hundrere, Liste2, Liste3, tiere, enere) are used for dynamic decomposition and recombination. ④ Suitable for upper‑primary to lower‑secondary arithmetic and geometry lessons, and as a GeoGebra classroom demonstration.