This is Math Lecture 1 for Class 1, Unit 1: Whole Numbers. In this lesson, students learn about whole numbers starting from 0 and identify numbers from 1 to 9 using real-life objects. The concept of zero as a number that shows nothing is introduced through simple examples. Students read and write numbers in both numerals and words, practice counting forward and backward from 9, and arrange numbers in ascending (small to big) and descending (big to small) order. They also learn how to find the number that comes before, after, and between other numbers. The lecture includes classroom activities such as number hunts, clapping games, songs, matching flashcards, object counting, and worksheets to help understand and practice these basic number concepts.