Tamil Nadu Board Class 10 Maths Chapter-Wise Marks Weightage 2027 - Samacheer Kalvi Blueprint

In short: Tamil Nadu SSLC Class 10 Maths 2027 carries 100 marks in the written exam (no separate internal assessment for the board exam). The paper is 3 hours long. Based on the Samacheer Kalvi syllabus, Algebra and Number Theory chapters carry about 22-25 marks, Geometry 18-20 marks, Trigonometry 10-12 marks, and Statistics/Probability 8-10 marks.

Understanding the Tamil Nadu Board Maths Paper

The Tamil Nadu Directorate of Government Examinations (DGE) conducts the SSLC exam. The Maths paper has a distinctive structure:

• Total marks: 100 (all theory, no separate internal assessment)
• Duration: 3 hours
• Syllabus: Samacheer Kalvi (8 units)

The Tamil Nadu Board uses its own Samacheer Kalvi textbook, which organizes content differently from NCERT. The 8 units cover broader mathematical concepts, and some topics go deeper than CBSE at the same grade level.

Paper structure:

• Section I: 14 questions x 1 mark = 14 marks (answer all)
• Section II: 10 questions x 2 marks = 20 marks (answer all)
• Section III: 10 questions x 5 marks = 50 marks (answer all)
• Section IV: 2 questions x 8 marks = 16 marks (answer all, with internal choice)

Unit-Wise Marks Breakdown

Unit 1: Relations and Functions (10-12 Marks)

• Types of relations and functions
• Arrow diagram, graph of a function
• Composition of functions
• Inverse of a function
• Identifying one-one, onto, bijection

This unit is unique to Tamil Nadu Board and not found at this level in CBSE or ICSE. It requires strong conceptual understanding. Practice arrow diagrams and function composition problems.

Unit 2: Numbers and Sequences (12-14 Marks)

• Euclid's Division Algorithm
• Fundamental Theorem of Arithmetic
• Sequences: AP and GP
• Sum of n terms of AP and GP
• Special series: sum of first n natural numbers, squares, cubes

This is the highest-weightage unit. GP (Geometric Progression) is included here, which CBSE covers only in Class 11. Make sure you know both AP and GP formulas:

• AP: an = a + (n-1)d, Sn = n/2[2a + (n-1)d]
• GP: an = ar(n-1), Sn = a(rn - 1)/(r - 1) when r > 1

Unit 3: Algebra (10-12 Marks)

• GCD and LCM of polynomials
• Solving simultaneous linear equations (graphical and algebraic)
• Quadratic equations (factorization, formula, nature of roots)
• Matrix (types, operations, determinant of 2x2 matrix)

Tamil Nadu Board includes matrices and polynomial GCD/LCM at the Class 10 level. These are additional topics compared to CBSE.

Unit 4: Geometry (10-12 Marks)

• Similar triangles (BPT, AA, SAS, SSS)
• Pythagoras Theorem
• Concurrency of medians, altitudes, angle bisectors, perpendicular bisectors
• Properties related to concurrency (centroid, orthocentre, incentre, circumcentre)

The concurrency topics (centroid, orthocentre, circumcentre, incentre) are unique to Tamil Nadu Board. Understand the properties of each point and how to locate them.

Unit 5: Coordinate Geometry (8-10 Marks)

• Area of triangle and quadrilateral using coordinates
• Straight line: slope, intercept form, two-point form, general form
• Equation of a line in various forms

Tamil Nadu Board covers equation of a line more thoroughly than CBSE at this level.

Unit 6: Trigonometry (10-12 Marks)

• Trigonometric ratios and identities
• Heights and distances
• Standard angles table

Unit 7: Mensuration (8-10 Marks)

• Surface area and volume of combined solids
• Conversion of solids
• Frustum of a cone

Unit 8: Statistics and Probability (8-10 Marks)

• Mean, median, mode from grouped data
• Standard deviation and variance
• Coefficient of variation
• Probability (classical and complementary)

Tamil Nadu Board includes standard deviation and coefficient of variation, which CBSE covers only in Class 11. These formula-based topics are scoring with practice.

Standard Deviation formula: sigma = sqrt[sum(fi x xi2)/N - (sum(fi x xi)/N)2]

Priority Matrix

Tier 1 (Highest marks): Numbers and Sequences (12-14m), Algebra (10-12m), Geometry (10-12m) = 32-38 marks Tier 2 (Good returns): Relations and Functions (10-12m), Trigonometry (10-12m), Coordinate Geometry (8-10m) = 28-34 marks Tier 3 (Important): Mensuration (8-10m), Statistics/Probability (8-10m) = 16-20 marks

Study Time Allocation for 60 Days

• Numbers and Sequences (AP + GP + special series): 8 days
• Algebra (Quadratic, Linear, Matrices, Polynomials): 8 days
• Geometry + Constructions: 7 days
• Relations and Functions: 5 days
• Trigonometry: 5 days
• Coordinate Geometry: 5 days
• Mensuration: 4 days
• Statistics and Probability: 4 days
• Revision + model papers: 14 days

Paper Strategy

1. Section I (14 marks): Answer all 14 one-mark questions carefully. These span all units and test basic understanding. Do not leave any blank.
2. Section II (20 marks): These 2-mark questions require short working. Show the formula and one key calculation step.
3. Section III (50 marks): This section carries half the marks. Allocate at least 90 minutes here. Show complete working for every step.
4. Section IV (16 marks): The 8-mark questions have internal choice. Read both options and pick the one you are more confident about.

Common Mistakes

1. In Relations and Functions, confusing one-one with onto. A function can be one-one without being onto, and vice versa.
2. In GP problems, making errors with the common ratio when it is a fraction. Be careful with r = 1/2 or r = 1/3 in sum formulas.
3. In Coordinate Geometry, confusing slope formula (y2-y1)/(x2-x1) with the section formula. Label your points clearly.
4. In Statistics, making calculation errors in standard deviation. Use a table format (xi, fi, fi.xi, fi.xi2) to organize your work.
5. Not attempting all questions. Unlike some boards, Tamil Nadu Board does not have overall choice in Sections I, II, and III. Leaving questions blank directly costs marks.

For more preparation tips, check out our guide on how to prepare for board exams in the last 3 months and common mistakes students make in maths board exams.

Frequently Asked Questions

Is Tamil Nadu Board Maths harder than CBSE?

Tamil Nadu Board covers some additional topics at the Class 10 level: Relations and Functions, Geometric Progressions, Matrices, Standard Deviation, and deeper Coordinate Geometry. The overall difficulty is slightly higher than CBSE, but the syllabus is well-structured with the Samacheer Kalvi textbook.

What is the passing marks for Tamil Nadu SSLC Maths?

You need 35 out of 100 marks to pass.

Are calculators allowed in Tamil Nadu Board Maths exam?

No, calculators are not allowed. All calculations must be done manually. This makes it important to practice mental arithmetic and avoid calculation errors.

How is Tamil Nadu Board Maths paper structured differently?

The paper is worth 100 marks (no separate internal assessment) with four sections of 1-mark, 2-mark, 5-mark, and 8-mark questions. This is different from CBSE which has an 80-mark theory paper plus 20 marks internal assessment.

Start Practicing Tamil Nadu Class 10 Maths on Padhaao

Padhaao covers all 8 units of Tamil Nadu SSLC Class 10 Maths, organized exactly as your Samacheer Kalvi textbook is structured. Tamil Nadu has unique topics like Relations and Functions, GP, and Standard Deviation that other boards skip at this level, and every unit is covered here with step-by-step solutions.

The exam practice mode generates DGE-pattern questions across all four sections, including the high-value 5-mark and 8-mark question formats. Important questions mode shows you the most likely questions for each unit based on previous year patterns.

10 learning modes available. 3 free chapters every day. No download needed.