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Marks Distribution of CBSE Class 9 Maths Syllabus(2020-21)
For the ease in exam preparation, we have provided marks weightage of Class 9 Maths syllabus in the table below.
|VI||Statistics & Probability||10|
UNIT I: NUMBER SYSTEMS
1. Real Numbers (10 Periods)
UNIT II: ALGEBRA
1. Polynomials (15 Periods)
Definition of a polynomial in one variable, with examples and counter examples. Coefficients of a polynomial, terms of a polynomial and zero polynomial. Degree of a polynomial. Constant, linear, quadratic and cubic polynomials. Monomials, binomials, trinomials. Factors and multiples. Zeros of a polynomial. Factorization of ax2 + bx + c, a ≠ 0 where a, b and c are real numbers, and of cubic polynomials using the Factor Theorem.
Recall of algebraic expressions and identities. Verification of identities:
and their use in factorization of polynomials.
2. Linear Equations in Two Variables (10 Periods)
Recall of linear equations in one variable. Introduction to the equation in two variables. Focus on linear equations of the type ax + by + c = 0. Prove that a linear equation in two variables has infinitely many solutions and justify their being written as ordered pairs of real numbers, plotting them and showing that they lie on a line. Graph of linear equations in two variables. Examples, problems from real life, including problems on Ratio and Proportion and with algebraic and graphical solutions being done simultaneously.
UNIT III: COORDINATE GEOMETRY
1. Coordinate Geometry (6 Periods)
The Cartesian plane, coordinates of a point, names and terms associated with the coordinate plane, notations, plotting points in the plane.
UNIT IV: GEOMETRY
1. Lines and Angles (13 Periods)
1. (Motivate) If a ray stands on a line, then the sum of the two adjacent angles so formed is 180o and the converse.
2. (Prove) If two lines intersect, vertically opposite angles are equal.
3. (Motivate) Results on corresponding angles, alternate angles, interior angles when a transversal intersects two parallel lines.
4. (Motivate) Lines which are parallel to a given line are parallel.
5. (Prove) The sum of the angles of a triangle is 180o.
6. (Motivate) If a side of a triangle is produced, the exterior angle so formed is equal to the sum of the two interior opposite angles.
2. Triangles (20 Periods)
1. (Motivate) Two triangles are congruent if any two sides and the included angle of one triangle is equal to any two sides and the included angle of the other triangle (SAS Congruence).
2. (Motivate) Two triangles are congruent if the three sides of one triangle are equal to three sides of the other triangle (SSS Congruence).
3. (Motivate) Two right triangles are congruent if the hypotenuse and a side of one triangle are equal (respectively) to the hypotenuse and a side of the other triangle (RHS Congruence).
4. (Prove) The angles opposite to equal sides of a triangle are equal.
5. (Motivate) The sides opposite to equal angles of a triangle are equal.
3. Quadrilaterals (10 Periods)
1. (Prove) The diagonal divides a parallelogram into two congruent triangles.
2. (Motivate) In a parallelogram opposite sides are equal, and conversely.
3. (Motivate) In a parallelogram opposite angles are equal, and conversely.
4. (Motivate) A quadrilateral is a parallelogram if a pair of its opposite sides is parallel and equal.
5. (Motivate) In a parallelogram, the diagonals bisect each other and conversely.
6. (Motivate) In a triangle, the line segment joining the mid points of any two sides is parallel to the third side and in half of it and (motivate) its converse.
4. Circles (12 Periods)
Through examples, arrive at definition of circle and related concepts-radius, circumference, diameter, chord, arc, secant, sector, segment, subtended angle.
1. (Prove) Equal chords of a circle subtend equal angles at the center and (motivate) its converse.
2. (Motivate) The perpendicular from the center of a circle to a chord bisects the chord and conversely, the line drawn through the center of a circle to bisect a chord is perpendicular to the chord.
3. (Motivate) Equal chords of a circle (or of congruent circles) are equidistant from the center (or their respective centers) and conversely.
4. (Prove) The angle subtended by an arc at the center is double the angle subtended by it at any point on the remaining part of the circle.
5. (Motivate) Angles in the same segment of a circle are equal.
6. (Motivate) The sum of either of the pair of the opposite angles of a cyclic quadrilateral is 180o and its converse.
5. Constructions (5 Periods)
1. Construction of bisectors of line segments and angles of measure 60o, 90o, 45o etc., equilateral triangles.
2. Construction of a triangle given its base, sum/difference of the other two sides and one base angle.
UNIT V: MENSURATION
1. Areas (2 Periods)
Area of a triangle using Heron’s formula (without proof).
2. Surface Areas and Volumes (12 Periods)
Surface areas and volumes of cubes, cuboids, spheres (including hemispheres) and right circular cylinders/cones.
UNIT VI: STATISTICS & PROBABILITY
1. Statistics (6 Periods)
Introduction to Statistics: Collection of data, presentation of data – tabular form, ungrouped / grouped, bar graphs.
2. Probability (9 Periods)
History, repeated experiments and observed frequency approach to probability.
Focus is on empirical probability. (A large amount of time to be devoted to group and to individual activities to motivate the concept; the experiments to be drawn from real life situations, and from examples used in the chapter on statistics).
QUESTION PAPER DESIGN
CLASS – IX (2020-21)
Time: 3 Hrs. Max. Marks: 80
Internal Assessment will be conducted as per the following marks distribution:
|Internal Assessment||20 Marks|
|Pen Paper Test and Multiple Assessment (5+5)||10 Marks|
|Lab Practical (Lab activities to be done from the prescribed books)||05 Marks|
Students can also find the deleted portion of CBSE Class 9 Maths syllabus 2020-21 from the table below:
|UNIT I-NUMBER SYSTEMS|
|REAL NUMBERS||Representation of terminating / non-terminating 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.|
|POLYNOMIALS||Motivate and State the Remainder Theorem with examples. Statement and proof of the Factor Theorem. x̣3+y3+z3-3xyz|
|LINEAR EQUATIONS IN TWO VARIABLES||Examples, problems on Ratio and Proportion|
|INTRODUCTION TO EUCLID’S GEOMETRY||Delete the Chapter|
|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 Deleted-Triangle inequalities and relation between ‘angle and facing side’ inequalities in triangles|
|AREA||Delete the Chapter|
|CIRCLES||There is one and only one circle passing through three given non-collinear 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|
|AREAS||Application of Heron’s Formula in finding the area of a quadrilateral.|
|UNIT VI-STATISTICS & PROBABILITY|
|STATISTICS||Histograms (with varying base lengths), Frequency polygons. Mean, median and mode of ungrouped data.|
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