The Central Board of Secondary recently released the revised syllabus for all subjects of class 10. Board has deleted some portion of the syllabus for the ease of students who will be taking their CBSE Board Exam next year. Due to COVID19, almost the first four months of this session have already passed in passive learning through selfstudy, online assignments, or online classes. So, to compensate for the loss of this study period and taking care of the learning outcomes so that the core concepts can be retained for students, CBSE announced a major syllabus reduction for the academic year 20202021.
Check best study plan and tips to score above 90% marks in CBSE Class 10 Maths Exam 2021
In this article, we are providing a list of the CBSE Class 10 Mathematics topics that are deleted from the original syllabus. We have collated the chapterwise topics which students need not prepare for the CBSE Class 10 Maths Board Exam 2020. By knowing the deleted portion of the Maths syllabus, students directly focus on those that are prescribed in the revised syllabus of class 10 Maths. This will help them in carrying out productive study sessions in the remaining part of the current academic year.
CBSE Class 10 Mathematics (041)  Deleted portion:
UNIT INUMBER SYSTEMS 

Chapter 
Topics 
REAL NUMBERS 
Euclid’s division lemma 
UNIT IIALGEBRA 

Chapter 
Topics 
POLYNOMIALS 
Statement and simple problems on division algorithm for polynomials with real coefficients. 
PAIR OF LINEAR EQUATIONS IN TWO VARIABLES 
cross multiplication method 
QUADRATIC EQUATIONS 
Situational problems based on equations reducible to quadratic equations 
ARITHMETIC PROGRESSIONS 
Application in solving daily life problems based on sum to n terms 
UNIT IIICOORDINATE GEOMETRY 

Chapter 
Topics 
COORDINATE GEOMETRY 
Area of a triangle 
UNIT IVGEOMETRY 

Chapter 
Topics 
TRIANGLES 
Proof of the following theorems are deleted · The ratio of the areas of two similar triangles is equal to the ratio of the squares of their corresponding sides. · In a triangle, if the square on one side is equal to sumof the squares on the other two sides, the angle opposite to the first side is a right angle. 
CIRCLES 
No Deletion 
CONSTRUCTIONS 
Construction of a triangle similar to a given triangle. 
UNIT V TRIGONOMETRY 

Chapter 
Topics 
INTRODUCTION TO TRIGONOMETRY 
Motivate the ratios whichever are defined at 0^{o} and 90^{o} 
TRIGONOMETRIC IDENTITIES 
Trigonometric ratios of complementary angles 
HEIGHTS AND DISTANCES 
No deletion 
UNIT VIMENSURATION 

AREAS RELATED TO CIRCLES 
Problems on central angle of 120° 
SURFACE AREAS AND VOLUMES 
Frustum of a cone 
UNIT VISTATISTICS & PROBABILITY 

Chapter 
Topics 
STATISTICS 
· Step deviation Method for finding the mean · Cumulative Frequency graph 
PROBABILITY 
No deletion 
Also Check: CBSE Class 10 Maths Paper Pattern & Sample Paper for Board Exam 2021
Check CBSE Class 10 Maths Detailed Syllabus (Revised)
We are also providing below the link to check the complete and detailed syllabus of CBSE Class 10 Maths that has been published with a 30% reduction in the original syllabus.
Also, check the following resources to make the best use of the rationalised syllabus and prepare effectively for the CBSE Board Exam 2021: