NCERT Solutions for Class 9 Maths Chapter 1 Number Systems Ex 1.1 helps you understand the concepts given in the chapter. All our solutions are prepared according to the new patterned NCERT Book and syllabus. This exercise has many concepts regarding rational numbers. One of the concepts is “There are infinitely many rational numbers between any two given rational numbers.” Solving class 9 maths NCERT solutions exercise 1.1 will help you to understand the chapter conceptually and ultimately help to ascend marks in the exams.