Foundation Mathematics for IIT-JEE/ Olympiad Class 9 is the thoroughly revised and updated 4th edition (2 colour) of the comprehensive book for class 9 students who aspire to become Engineers. The book goes for a complete makeover to 2-colour (from B&W) so as to make it more reader friendly. The theoretical concepts in the book are accompanied by Illustrations, Check Points, Do You Know?, Idea Box, and Knowledge Enhancer. The book has in total 1530 questions divided into 4 levels of fully solved exercises, which are graded as per their level of difficulty. Exercise 1: FIB, True-False, Matching, Very Short, Short and Long Answer Type Questions Exercise 2: Textbook, Exemplar and HOTS Questions Exercise 3 & 4: MCQs 1 Correct, MCQs>1 Correct, Passage, Assertion-Reason, Multiple Matching and Integer Type Questions. The book adheres to the latest syllabus set by the NCERT, going beyond by incorporating those topics which will assist the students scale-up in the next classes to achieve their academic dreams of Engineering. These topics are separately highlighted as Connecting Topics and an exercise is developed on the same.