In the first chapter of Class 9 Mathematics, titled "Real Numbers," students will gain a comprehensive understanding of surds and logarithms. They will start by learning about surds, including their definition, types, and the operations that can be performed on them. The chapter will also cover surd rationalization and the method to find the square root of a quadratic surd. Following this, students will delve into logarithms, exploring the logarithmic function, the different types of logarithms, and the essential laws that govern them. This chapter aims to provide students with a strong foundation in these critical mathematical concepts, which are essential for their progression in mathematics.