Yes, it is perfectly fine to look at the RS Aggarwal Class 9 Solutions Chapter 1 Number Systems before the chapter is taught in class. But you should make sure you’ve read the theory part carefully and understand what the chapter is trying to say. This Solution by RS Aggarwal only has the answers to the questions in the textbook, so it’s important to know what the questions are about. So, you can get to the RS Aggarwal Class 9 Solutions Chapter-1 Number Systems and understand the ideas well while they are being taught in class.