National Institute of Open Schooling (NIOS) | Class X Syllabus - Mathematics
Mathematics Syllabus Class X
Secondary Course (Mathematics)
Mathematics is an important discipline of learning at the secondary stage. It helps the
learners in acquiring decision- making ability through its applications to real life both in familiar
and unfamiliar situations. It predominately contributes to the development of precision, rational
and analytical thinking, reasoning and scientific temper. One of the basic aims of teaching
Mathematics at the Secondary stage is to inculcate the skill of quantification of experiences
around the learner. Mathematics helps the learners to understand and solve the day to day life
problems faced by them including those from trade, banking, sales tax and commission in
transaction. It also helps them to acquire the skill of representing data in the form of tables/graphs
and to draw conclusions from the same.
The present curriculum in Mathematics includes the appreciation of the historical development of
mathematical knowledge with special reference to the contribution of Indian mathematicians
particularly in the introduction of zero, the decimal system of numeration in the international
form (popularly known as Hindu – Arabic numerals ). The learners are encouraged to enhance
their computational skills using Vedic Mathematics.
The main objectives of teaching Mathematics at the Secondary stage are to enable the
learners to :
· acquire knowledge and understanding of the terms, concepts, symbols, principles and
· acquire the skill of quantification of experiences around them.
· acquire the skill of drawing geometrical figures, charts and graphs representing given data.
· interpret tabular/graphical representation of the data.
· articulate logically and use the same to prove results.
· translate the word problems in the mathematical form and solve them.
· appreciate the contribution of Indian mathematicians towards the development of the subject.
· develop interest in Mathematics.
DESCRIPTION OF COURSE
The present syllabus in Mathematics has been divided into six modules namely Algebra
,Commercial Mathematics ,Geometry, Mensuration ,Trigonometry and Statistics .
The marks allotted , number of lessons and suggested study time for each module are as under :
|Name of the module
( in hours )
|2. Commercial Mathematics
There will be three Tutor Marked Assignments (TMA’s) to be attempted by the learner. The
awards/grades of the best two TMA’s will be reflected in the Mark sheet.
DETAILED DESCRIPTION OF EACH MODULE IS AS FOLLOWS :
Module 1 : Algebra
Study time : 50 Hours Marks : 26
Scope and Approach : Algebra is generalized form of arithmetic. Here we would deal with
unknowns in place of knowns as in arithmetic. These knowns are, in general, numbers. It may be
recalled that the study of numbers begin with natural numbers without which we would not be
able to count. The system of natural numbers is extended to rational number system. To be able
to measure all lengths in terms of a given unit, the rational numbers have to be extended to real
numbers. Exponents and indices would simplify repeated multiplication and their laws would be
introduced. These would be used to write very large and very small numbers in the scientific
Algebraic expressions and polynomials would be introduced with the help of four fundamental
operations on unknowns. Equating two algebraic expressions or polynomials leads to equations. In the module a study of linear and quadratic equations would be taken up to solve problems of
The learners would be acquainted with different number patterns. One such pattern, namely Arithmetic Progression would be studied in details.
- 1.1 Number Systems
--Review of natural numbers ,integers and rational numbers, rational numbers as
terminating or non – terminating decimals. Introduction of irrational numbers as nonterminating
and non – recurring decimals.
--Rounding of rational numbers and irrational numbers. Real numbers.
--Representation of irrational numbers such as 2 , 3 and 5 on the number line.
--Operations on rational and irrational numbers.
- 1.2 Indices ( Exponents )
--Exponential notation ,meaning of exponent ,laws of exponents. Applications of laws of
exponents. Expressing numbers as product of powers of prime numbers. Scientific
- 1.3 Radicals( Surds )
--Meaning of a radical, index and radicand. Laws of radicals. Simplest form of a radical.
--Rationalising a radical in the denominator. Simplification of expressions involving
- 1.4 Algebraic Expressions and Polynomials
--Introduction to variables. Algebraic expressions and polynomials. Operations on algebraic
expressions and polynomials. Degree of a polynomial. Value of an algebraic expression .
- 1.5 Special Products and Factorisation
--Special products of the type ( a ± b )2 , (a + b)(a – b) , ( a ± b )3.
--Application of these to calculate squares and cube of numbers.
--Factorisation of the algebraic expressions.
--Factorisation of expressions of the form a2 – b2, a3 ± b3 .
--Factorisation of the polynomial of the form ax2 + bx + c ( a ¹ 0) by splitting the middle
--H.C.F and L.C.M of two polynomials in one variable only by factorisation.
--Rational expressions. Rational expression in the simplest form.
--Operations on rational expressions.
- 1.6 Linear Equations
--Linear equations in one variable and in two variables. Solution of a linear equation in one
--System of linear equations in two variables. Graph of a linear equation in two variables.
--Solution of a system of linear equations in two variables ( graphical and algebraic
--Solving word problems involving linear equations in one or two variables.
- 1.7 Quadratic Equations
--Standard form of a quadratic equation : ax2 + bx + c = 0 , a ¹ 0.
--Solution of ax2 + bx + c = 0 , a ¹ 0 by (i) factorization (ii) quadratic formula.
--Formation of quadratic equation with given roots. Application of quadratic equations to
solve word problems.
- 1.8 Number Patterns
-Recognition of number patterns. Arithmetic and Geometric progressions. nth term and
sum to n terms of an Arithmetic Progression.
Module 2 : Commercial Mathematics
Study time : 35 Hours Marks : 15
Scope and Approach : After passing Secondary level examination ,some learners may work in
banks, business, houses, insurance companies dealing with sales tax ,income tax , excise duty etc.
Some other may enter business and ind ustry. Some may go for higher studies. All of them will
need mathematics of finance. In any case ,every citizen has to deal with problems involving
interest , investment , purchases etc. It is in this context ,the present module would be developed.
In this module , applications of compound interest in the form of rate of growth ( appreciation )
and depreciation(decay) will be dealt. In solving problems related to all the stated areas , the
basic concepts of direct and inverse proportion (variation) ,and percentage are all pervading.
- 2.1 Ratio and Proportion
Review of ratio and proportion. Application of direct and inverse proportion (variation).
- 2.2 Percentage and its Applications
Concept of percentage. Conversion of percents to a decimal ( fraction ) and vice -
versa. Computations involving percentage.
Applications of percentage to (i) profit and loss (ii) simple interest
(iii) discount (rebate ) (iv) sales tax
(v) commission in transaction (vi) instalment buying
- 2.3 Compound Interest
Compound interest and its application to rate of growth and depreciation.
(conversion periods not more than 4 )
- 2.4 Banking
Concept of Banking. Types of accounts : (a) Saving (b) Fixed/term deposit
Calculation of interest in saving account and on fixed deposit with not more than 4
Module 3 : Geometry
Study time : 75 Hours Marks : 25
Scope and Approach : Looking at the things around him , the learner sees the corners
,edges , top of a table , circular objects like rings or bangles and similar objects like
photographs of different sizes made from the same negative which arouse his curiosity to
know what they represent geometrically.
To satisfy the learners curiosity and to add to his knowledge about the above things, the
lessons on Lines and Angles, congruent and similar triangles and circles will be
introduced. Some of the important results dealing with above concepts would be verified
experimentally while a few would be proved logically. Different types of quadrilaterals
would also be introduced under the lessons on Quadrilaterals and Areas.
The learners would also be given practice to construct some geometrical figures using
geometrical instruments. In order to strengthen graphing of linear equations , the basic
concept of coordinate geometry has been introduced.
Note : Proofs of only “ * ” marked propositions and riders based on “ * ” marked
propositions using unstarred propositions may be asked in the examination.
However direct numerical problems based on unstarred propositions may also be asked in
- 3.1 Lines and Angles
Basic geometrical concepts : point ,line ,plane,parallel lines and intersecting lines in a
plane. Angles made by a transversal with two or more lines.
--If a ray stands on a line, the sum of the two angles so formed is 180o.
--If two lines intersect, then vertically opposite angles are equal.
--If a transversal intersects two parallel lines then corresponding angles are equal.
--If a transversal intersects two parallel lines then
(a) alternate angles are equal
(b) interior angles on the same side of the transversal are supplementary.
--If a transversal intersects two lines in such a way that
(a) alternate angles are equal ,then the two lines are parallel.
(b) interior angles on the same side of the transversal are supplementary ,then the two
lines are parallel.
*Sum of the angles of a triangle is 180o.
--An exterior angle of a triangle is equal to the sum of the interior opposite angles.
--Concept of locus (daily life examples may be given)
--The locus of a point equidistant from two given :
(a) points (b) intersecting lines.
- 3.2 Congruence of Triangles
--Concept of congruence through daily life examples . Congruent figures.
--Criteria for congruence of two triangles namely : SSS,SAS,ASA,RHS
*Angles opposite to equal sides of a triangle are equal.
*Sides opposite to equal angles of a triangle are equal.
*If two sides of a triangle are unequal ,then the longer side has the greater angle
opposite to it.
--In a triangle , the greater angle has the longer side opposite to it.
--Sum of any two sides of a triangle is greater than the third side.
- 3.3 Concurrent Lines
--Concept of concurrent lines.
--Angle bisectors of a triangle pass through the same point.
--Perpendicular bisectors of the sides of a triangle pass through the same point.
--In a triangle the three altitudes pass through the same point.
--Medians of a triangle pass through the same point which divides each of the medians in
the ratio 2 : 1.
- 3.4 Quadrilaterals
--Quadrilateral and its types.
--Properties of special quadrilaterals viz. trapezium ,parallelogram ,rhombus , rectangle
--In a triangle , the line segment joining the mid points of any two sides is parallel to the
third side and is half of it.
--The line drawn through the mid point of a side of a triangle parallel to another side bisects
the third side.
--If there are three or more parallel lines and the intercepts made by them on a transversal
are equal, the corresponding intercepts on any other transversal are also equal.
--A diagonal of a parallelogram divides it into two triangles of equal area.
*Parallelograms on the same or equal bases and between the same parallels are equal in
--Triangles on the same or equal bases and between the same parallels are equal in area.
--Triangles on equal bases having equal areas have their corresponding altitudes equal.
- 3.5 Similarity of Triangles
--Similar figures ,concept of similarity in geometry. Basic proportionality theorem and its
--If a line is drawn parallel to one side of a triangle , the other two sides are divided in the
--If a line divides any two sides of a triangle in the same ratio , it is parallel to the third side.
--Criteria for similarity of triangles : AAA, SSS and SAS .
--If a perpendicular is drawn from the vertex of the right angle of a triangle to its
hypotenuse , the triangles on each side of the perpendicular are similar to the whole
triangle and to each other.
--The internal bisector of an angle of a triangle divides the opposite side in the ratio of the
sides containing the angle.
--Ratio of the areas of two similar triangles is equal to the ratio of the squares on their
*In a right triangle ,the square on the hypotenuse is equal to the sum of the squares on the
other two sides (Baudhayan / Pythagoras theorem)
In a triangle ,if the square on one side is equal to the sum of the squares on the remaining
two sides ,the angle opposite to the first side is a right angle
( converse of Baudhayan /Pythagoras theorem)
- 3.6 Circles
Definition of a circle and related concepts. Concept of concentric circle.
Congruent circles :
--Two circles are congruent if and only if they have equal radii.
--Two arcs of a circle( or congruent circles) are congruent , if the angles subtended by them
at the centre(s) are equal and its converse.
--Two arcs of a circle( or congruent circles)are congruent ,if their corresponding chords are
equal , and its converse.
--Equal chords of a circle( or congruent circles) subtend equal angles at the centre(s) and
conversely , if the angles subtended by the chords at the centre of a circle are equal , then
the chords are equal.
--Perpendicular drawn from the centre of a circle to a chord bisects the chord.
--The line joining the centre of a circle to the mid point of a chord is perpendicular to the
--There is one and only one circle passing through three given non collinear points.
--Equal chords of a circle (or of congruent circles) are equidistant from the centre (centres)
and its converse.
- 3.7 Angles in a Circle and Cyclic Quadrilateral
The angle subtended by an arc at the centre is double the angle subtended by it at any
point on the remaining part of the circle.
*Angles in the same segment of a circle are equal.
Angle in a semi circle is a right angle.
*Sum of the opposite angles of a cyclic quadrilateral is 180o.
If a pair of opposite angles of a quadrilateral is supplementary , then the quadrilateral is
- 3.8 Secants , Tangents and their Properties
Intersection of a line and a circle. Point of contact of a line and a circle.
A tangent at any point of a circle is perpendicular to the radius through the point of
Tangents drawn from an external point to a circle are of equal length.
If two chords AB and CD of a circle intersect at P (inside or outside the circle),
then PA ´ PB = PC ´ PD
If PAB is a secant to a circle intersecting the circle at A and B, and PT is a tangent to the
circle at T, then PA ´ PB = PT2.
If a chord is drawn through the point of contact of a tangent to a circle , then the angles
which this chord makes with the given tangent are equal respectively to the angles formed
by the chord in the corresponding alternate segments.
- 3.9 Constructions
--Division of a line segment internally in a given ratio.
--Construction of triangles with given data:
(a) Construction of a triangle with given data : SSS , SAS , ASA , RHS
(b) perimeter and base angles (c) its base , sum and difference of the other two sides and
one base angle.(d) its two sides and a median corresponding to one of these sides.
--Construction of parallelograms , rectangles, squares , rhombuses and trapeziums.
--Constructions of quadrilaterals given :
(a) four sides and a diagonal (b) three sides and both diagonals
(c) two adjacent sides and three angles (d) three sides and two included angles
(e) four sides and an angle
--Construction of a triangle equal in area to a given quadrilateral.
--Construction of tangents to a circle from a point
(a) outside it
(b) on it using the centre of the circle .
--Construction of circumcircle and incircle of a triangle.
- 3.10 Coordinate Geometry
Coordinate system. Distance between two points. Section formula (internal division only).
Coordinates of the centroid of a triangle.
Module 4 : Mensuration
Study time : 25 Hours Marks : 10
Scope and Approach : In this module an attempt would be made to answer the following
questions arising in our daily life.
--How do you find the length of the barbed wire needed to enclose a rectangular kitchen garden ?
--What is the cost of constructing two perpendicular concrete rectangular paths ?
--What is the area of the four walls of a room with given dimensions ?
--How much plywood is needed to be fixed on the top of a rectangular table ?
--The formulae for areas of plane figures would be taught in the first lesson.
In the second lesson , the surface and volume of the different solids ( three dimensional figures )
would be taken up and formulae given. Their applications to daily life situations would then be
- 4.1 Area of Plane Figures
--Rectilinear figures. Perimeter and area of a square , rectangle ,triangle, trapezium ,
quadrilateral , parallelogram and rhombus.
--Area of a triangle using Hero’s formula. Area of rectangular paths .
--Simple problems based on the above.
--Non rectilinear figures : Circumference and area of a circle.
--Area and perimeter of a sector.
--Area of circular paths. Simple problems based on the above.
- 4.2 Surface Area and Volume of Solids
--Surface area and volume of a cube , cuboid , cylinder , cone , sphere and hemisphere.
( combination of two solids should be avoided ).
--Area of four walls of a room.
Module 5 : Trigonometry
Study time : 20 Hours Marks : 12
Scope and Approach : In astronomy one often encounters the problems of predicting the
position and path of various heavenly bodies ,which in turn requires the way of finding the
remaining sides and angles of a triangle provided some of its sides and angles are known. The
solutions of these problems has also numerous applications to engineering and geographical
surveys ,navigation etc. An attempt has been made in this module to solve these problems. It is
done by using ratios of the sides of a right triangle with respect to its acute angle called
trigonometric ratios. The module will enable the learners to find other trigonometric ratios
provided one of them is known. It also enables the learners to establish well known identities and
to solve problems based on trigonometric ratios and identities.
Measurement of accessible lengths and heights (e.g. height of a pillar, height of a house etc.) and
inaccessible heights ( e.g. height of a hill top, height of a lamp post on the opposite bank of a
river (without bridge),celestial objects etc. ) is a routine requirement. The learners will be able to
distinguish between angles of elevation and depression and use trigonometric ratios for solving
simple real life problems based on heights and distances , which do not involve more than two
- 5.1 Introduction to Trigonometry
Trigonometric ratios of an acute angle of a right triangle.
Relationships between trigonometric ratios.
Trigonometric identities : sin2q + cos2q = 1, sec2q = 1+ tan2q, cosec2q = 1+ cot2q
Problems based on trigonometric ratios and identities.
- 5.2 Trigonometric Ratios of Some Special Angles
Trigonometric ratios of 30o,45o and 60o.
(Results for trigonometric ratios of 30o,45o and 60o to be proved geometrically)
Trigonometric ratios of complementary angles.
Application of these trigonometric ratios for solving problems such as heights and
distances( problems on heights and distances should not involve more than two right
Module 6 : Statistics
Study time : 35 Hours Marks :12
Scope and Approach : Since ancient times, it has been the practice by the householders ,
shopkeepers , individuals etc to keep records of their receipts, expenditures and other resources.
To make the learners acquainted with the methods of recording, condensing and culling out
relevant information from the given data, the learners would be exposed to the lesson on Data
and their Representation.
Everyday we come across data in the form of tables, graphs, charts etc on various aspects of
economy, advertisements which are eye catching. In order to read and understand these, the
learners would be introduced to the lesson on Graphical Representation of Data.
Sometimes we are required to describe data arithmetically like average age of a group median
score of a group or modal collar size of a group. To be able to do this, the learners would be
introduced to the lesson on Measures of Central Tendency. They would also be taught
characteristics and limitation of these measures.
‘It will rain today’, ‘India will win the match against England’, are statements that involve the
chance factor. The learners would be introduced to the study of elementary probability as
measure of uncertainty, through games of chance- tossing a coin, throwing a die , drawing a card
at random from a well shuffled pack etc.
- 6.1 Data and their Representation
--Introduction to Statistics. Statistics and statistical data. Primary and secondary data.
--Ungrouped/raw and grouped data. Class marks ,class intervals , class limits and true class
limits. Frequency, frequency distribution table. Cumulative frequency.
--Cumulative frequency table.
- 6.2 Graphical Representation of Data
--Drawing of Bar charts, Histograms and frequency polygons.
--Reading and interpretation of Bar charts and Histograms. Reading and construction of
graphs related to day to day activities ;temperature – time graph ,pressure – volume graph
and velocity – time graph etc.
- 6.3 Measures of Central Tendency
--Mean of ungrouped (raw ) and grouped data. Mode and median of raw data.
--Properties of mean and median .
- 6.4 Introduction to Probability
--Elementary idea of probability as a measure of chance of occurrence of an event
( for single event only ) Problems based on tossing a coin ,throwing a die, drawing a card
from a well shuffled pack .
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