Tamil Nadu Board of Secondary Education Class 8 Mathematics Syllabus - Free PDF Download
Tamil Nadu Board of Secondary Education Syllabus 2025-26 Class 8: The Tamil Nadu Board of Secondary Education Class 8 Mathematics Syllabus for the examination year 2025-26 has been released by the Tamil Nadu Board, Tamil Nadu Board of Secondary Education. The board will hold the final examination at the end of the year following the annual assessment scheme, which has led to the release of the syllabus. The 2025-26 Tamil Nadu Board of Secondary Education Class 8 Mathematics Board Exam will entirely be based on the most recent syllabus. Therefore, students must thoroughly understand the new Tamil Nadu Board of Secondary Education syllabus to prepare for their annual exam properly.
The detailed Tamil Nadu Board of Secondary Education Class 8 Mathematics Syllabus for 2025-26 is below.
Academic year:
Tamil Nadu Board of Secondary Education Class 8 Mathematics Revised Syllabus
Tamil Nadu Board of Secondary Education Class 8 Mathematics and their Unit wise marks distribution
Tamil Nadu Board of Secondary Education Class 8 Mathematics Course Structure 2025-26 With Marking Scheme
| # | Unit/Topic | Weightage |
|---|---|---|
| 1 | Numbers | |
| 2 | Measurements | |
| 3 | Algebra | |
| 4 | Life Mathematics | |
| 5 | Geometry | |
| 6 | Statistics | |
| 7 | Information Processing | |
| Total | - |
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Syllabus
1 Numbers
- Concept for Natural Numbers
- Concept for Whole Numbers
- Concept of Integers
- Rational Numbers
- Rational Numbers on a Number Line
- Decimal Representation of Rational Numbers
- Positive and Negative Rational Numbers
- Equivalent Rational Number
- Rational Numbers in Standard Form
- Comparison of Rational Numbers
- Rational Numbers Between Two Rational Numbers
- Addition of Rational Number
- Additive Inverse of Rational Number
- Subtraction of Rational Number
- Division of Rational Numbers
- Word Problems on Rational Numbers (All Operations)
- Properties of Rational Numbers
- Closure Property of Rational Numbers
- Commutative Property of Rational Numbers
- Associative Property of Rational Numbers
- Distributive Property of Multiplication Over Addition for Rational Numbers
- Identity of Addition and Multiplication of Rational Numbers
- Concept of Reciprocal or Multiplicative Inverse
- Concept of Square Number
- Properties of Square Numbers
- Concept of Square Roots
- Finding square roots
- Finding Square Root Through Prime Factorisation
- Finding Square Root by Division Method
- Finding the Square Root of a Perfect Square
- Square Root of Decimal Numbers
- Square Root of Product and Quotient of Numbers
- Estimating Square Root
- Concept of Cube Number
- Properties of Cubes of Numbers
- Concept of Cube Root
- Cube Root Through Prime Factorisation Method
- Concept of Exponents
- Laws of Exponents
- Numbers with Exponent Zero, One, Negative Exponents
- Multiplying Powers with the Same Base
- Dividing Powers with the Same Base
- Taking Power of a Power
- Multiplying Powers with Different Base and Same Exponents
- Dividing Powers with Different Base and Same Exponents
- Expanded Form of Numbers Using Exponents
- Crores
- Introducing crores
- A standard form of large numbers
2 Measurements
- Measurements
- Measurement
- The need for measurement in daily life
- Concept of Circle
- Arc, Segment, Sector
- Central Angle and the Measure of an Arc
- Length of an Arc
- Area of the Sector
- Perimeter of a Sector
- Perimeter and Area of Combined Shapes
- Impact on Removing / Adding a portion from / to a given shape
- Three Dimensional Shapes
- Faces, Edges and Vertices
- Nets for Building 3-d Shapes
- Drawing Solids on a Flat Surface - Isometric Sketches
- Cross Section of Solid Shapes
- Volume = Area of cross - section x length
- Surface area ( excluding cross - section ) = Perimeter of cross - section x length
- Viewing Different Sections of a Solid
3 Algebra
- Algebraic Expressions
- Variable
- Constant
- Algebraic Expressions
- Value of Expression
- Number line and an expression
- Terms, Factors and Coefficients of Expression
- Like and Unlike Terms
- Types of Algebraic Expressions as Monomials, Binomials, Trinomials, and Polynomials
- Addition of Algebraic Expressions
- Subtraction of Algebraic Expressions
- Multiplication of Algebraic Expressions
- Multiplying Monomial by Monomials
- Multiplying a Monomial by a Binomial
- Multiplying a Monomial by a Trinomial
- Multiplying a Binomial by a Binomial
- Multiplying a Binomial by a Trinomial
- Division of Algebraic Expressions
- Dividing a Monomial by a Monomial
- Dividing a Polynomial by a Monomial
- Concept of Identity
- Expansion of (a + b)2 = a2 + 2ab + b2
- Expansion of (a - b)2 = a2 - 2ab + b2
- Expansion of (a + b)(a - b) = a2-b2
- Expansion of (x + a)(x + b)
- Expansion of (a + b)3
- Expansion of (a - b)3
- Expansion of (x + a)(x + b)(x + c)
- Factorising Algebraic Expressions
- Factorisation by Taking Out Common Factors
- Factorisation by Taking Out the Common Binomial Factor from Each Term
- Factorisation by Regrouping Terms
- Factorisation Using Identities
- Factors of the Form (x + a)(x + b)
- Factorise Using the Identity (a + b)3
- Factorise Using the Identity (a – b)3
- Concept of Find the Error
- Linear Equation in One Variable
- Expressions with Variables
- Concept of Equation
- The Solution of an Equation
- Graph
- Graph
- Graph sheets
- Cartesian Coordinate System
- Co-ordinates of Points
- Quadrants and Sign Convention
- Plotting a Point in the Plane If Its Coordinates Are Given.
- Geometrical Representation of a Linear Equation by Plotting a Straight Line
- Geometrical Representation of a Linear Equation by Line Parallel to the Coordinate Axes
- Linear Pattern
- Graph of a Linear Equation in Two Variables
4 Life Mathematics
- Basic Concept of Percentage
- Basic Concepts of Profit and Loss
- Concept of Compound Interest
- Difference Between Compound Interest and Simple Interest
- Compound Variation
- Proportion Method
- Multiplicative Factor Method
- Formula Method
- Concept of Direct Proportion
- Concept of Inverse Proportion
- Time and Work
- Unitary Method
- Sharing of the money for work
5 Geometry
- Congruency of Shapes
- Similar Figures
- Congruence of Triangles
- Criteria for Congruence of Triangles
- SSS Congruence Criterion
- SAS Congruence Criterion
- ASA Congruence Criterion
- RHS Congruence Criterion
- Similarity of Triangles
- Right-angled Triangles and Pythagoras Property
- Converse of Pythagoras Theorem
In a triangle if the square of one side is equal to the sum of the squares of the remaining two sides, then the triangle is a right angled triangle.
- Point of Concurrency
- Median of a Triangle
- Altitudes of a Triangle
- Perpendicular Bisectors of a Triangle
- Circumcentre of a Triangle
- The Property of the Angle Bisectors of a Triangle
- Constructing a Quadrilateral
- Constructing a Quadrilateral When the Lengths of Four Sides and a Diagonal Are Given
- Constructing a Quadrilateral When Two Diagonals and Three Sides Are Given
- Constructing a Quadrilateral When Three Sides and Two Included Angles Are Given
- Constructing a Quadrilateral When Two Adjacent Sides and Three Angles Are Known
- Construct a Quadrilateral When Its Four Sides and One Angle Are Given.
- Constructing a trapezium when its three sides and one diagonal are given
- Constructing a Trapezium When Its Three Sides and One Angle Are Given
- Constructing a Trapezium When Its Two Sides and Two Angles Are Given.
- Constructing a Trapezium When Its Four Sides Are Given.
- Constructing a Parallelogram When Its Two Adjacent Sides and One Angle Are Given.
- Constructing a Parallelogram When Its Two Adjacent Sides and One Diagonal Are Given.
- Constructing a Parallelogram When Its Two Diagonals and One Included Angle Are Given.
- Constructing a Parallelogram When Its One Side, One Diagonal and One Angle Are Given.
- Construction of a Rhombus When One Side and One Diagonal Are Given.
- Construction of a Rhombus When One Side and One Angle Are Given.
- Construction of a Rhombus When Two Diagonals Are Given.
- Construction of a Rhombus When One Diagonal and One Angle Are Given.
- Construction of a Rectangle When Its Length and Breadth Are Given.
- Construction of a Rectangle When a Side and a Diagonal Are Given.
- Construction of a Square When Its Side is Given.
- Construction of a Square When Its Diagonal is Given.
6 Statistics
- Concept of Data Handling
- Data Handling
- Data
- Types of Data
- Organisation of Data
- Ungrouped Data
- Grouped Data
- Frequency Distribution Table
- Ungrouped Frequency Distribution Table
- Grouped Frequency Distribution Table
- Concept of Pie Graph (Or a Circle-graph)
- Interpretation of Pie Diagram
- Graphical Representation of Data as Histograms
- Construction of a histogram for continuous frequency distribution
- Construction of histogram for discontinuous frequency distribution.
- Frequency Polygon
7 Information Processing
- Information Processing
- Principles of Counting
- Addition principle
- Multiplication principle
- SET - Game
- Map Colouring
- Fibonacci Numbers
- Highest Common Factor
- Prime Factorisation
- Factorisation by Taking Out Common Factors
- Repeated Division Method of HCF
- Repeated Subtraction Method
- Cryptology
- Cryptology – Some technical details
- Examples of Cipher Code
- Shopping Comparison
- Comparing containers of diff erent size.
- Packing
