Class 9 Maths Chapter 1 ´Number System` of NCERT ... All the rational and irrational numbers make up the collection of real numbers. • If r is rational and s is irrational, then r + s and ...

CBSE Class 9 Maths extra Questions for Chapter 1 - Number System (with Answers). These questions are NCERT based important for the preparation of the upcoming CBSE 9th Maths Exam 2020-21.