In Class IX, you were introduced to real numbers and learned about irrational numbers. In this chapter, we further extend our study of real numbers.
Carl Friedrich Gauss(1777 - 1855) is often referred to as the 'Prince of Mathematicians' and is considered one of the three greatest mathematicians of all time, along with Archimedes and Newton. He has made fundamental contributions to both mathematics and science.

Numbers and its types:
Numbers are fundamental mathematical concepts for counting, measuring and labelling, forming the basis of arithmetic, with major types. They are natural numbers, whole numbers, integers, rational numbers, irrational numbers and real numbers.

Let us see some properties of real numbers in this chapter.
1. The fundamental theorem of arithmetic.
2. LCM and HCF
3. Applications and usage of the above properties.