This document describes a lesson plan titled "¡Pajaritos a volar!" (Birds Flying Away) for pre-school students. The lesson focuses on number concepts including addition, subtraction, comparing magnitudes, and counting. Students will listen to a story about birds in a park and help count the birds. They will then group the birds by color and answer questions about quantities. The goal is for students to practice enumeration, cardinal value, addition, recognizing colors, and order irrelevance. Materials include paper, foam bird cutouts in four colors, and velcro.