Since, CBSE has revised the syllabus of all subjects of Class 9, it becomes quite necessary for students to know the topics and chapters removed from the previous syllabus so that they do not study the irrelevant content. Knowing the deleted syllabus will help students to make the right plan for preparing other topics properly. This will help them in carrying out productive study sessions while being at home. Check below the complete list of the topics/chapters removed from the CBSE Class 9 Maths Syllabus.
CBSE Class 9 Mathematics (041)  Deleted portion:
UNIT INUMBER SYSTEMS 

Chapter 
Topics 
REAL NUMBERS 
· Representation of terminating / nonterminating recurring decimals on the number line through successive magnification. · Explaining that every real number is represented by a unique point on the number line and conversely, viz. every point on the number line represents a unique real number. · Definition of nth root of a real number. 
UNIT IIALGEBRA 

Chapter 
Topics 
POLYNOMIALS 
· Motivate and State the Remainder Theorem with examples. Statement and proof of the Factor Theorem. · x^{3}+y^{3}+z^{3}3xyz 
LINEAR EQUATIONS IN TWO VARIABLES 
Examples, problems on Ratio and Proportion 
UNIT IIICOORDINATE GEOMETRY 

Chapter 
Topics 
COORDINATE GEOMETRY 
No deletion 
UNIT IVGEOMETRY 

Chapter 
Topics 
INTRODUCTION TO EUCLID'S GEOMETRY 
Delete the Chapter 
LINES AND ANGLES 
No Deletion 
TRIANGLES 
Proof of the theorem deleted Two triangles are congruent if any two angles and the included side of one triangle is equal to any two angles and the included side of the other triangle (ASA Congruence). Topic DeletedTriangle inequalities and relation between ‘angle and facing side' inequalities in triangles 
QUADRILATERALS 
No deletion 
AREA 
Delete the Chapter 
CIRCLES 
There is one and only one circle passing through three given noncollinear points. If a line segment joining two points subtends equal angle at two other points lying on the same side of the line containing the segment, the four points lie on a circle. 
CONSTRUCTIONS 
Construction of a triangle of given perimeter and base angles 
UNIT V Mensuration 

Chapter 
Topics 
UNIT VIMENSURATION 

AREA 
Application of Heron’s Formula in finding the area of a quadrilateral. 
SURFACE AREAS AND VOLUMES 
No deletion 
UNIT VISTATISTICS & PROBABILITY 

Chapter 
Topics 
STATISTICS 
· Histograms (with varying base lengths), · Frequency polygons. · Mean, median and mode of ungrouped data. 
PROBABILITY 
No deletion 
Here, you can also check the revised and latest syllabus of CBSE Class 9 Maths. With this syllabus, you will get to know the complete course content that you need to study in the current academic session and prepare the same for the yearend annual exam. Check the complete syllabus from the link given below:
Important* CBSE Class 9 Maths Complete Study Package for Annual Exam 2021