Multiplication with positive integers, based on Carlos Andres Romero Mendivil's multiplication method.
Carlos Andrés Roberto Mendivil, for creating the original method for the numbers 1 to 10, as described in this article:
Romero Mendivil, C. A. (2026). Multiplica con tus Manos - El Método Romendi (Patent). Zenodo. https://doi.org/10.5281/zenodo.20783678