This document outlines a lesson plan for teaching natural numbers to 1st year high school students (1o ESO) during the 2012-2013 academic year. It includes the dates that different topics will be explained in class and the corresponding exercises and pages in the textbook that students will complete for homework. There are two groups (A and B) that will follow the same schedule, with exams occurring on October 16th for Group A and October 17th for Group B. The plan lists the textbook pages and exercises to be completed each day.