Chapter 8
Decimals
8.1 Introduction
Savita and Shama were going to market to buy some stationary items.
Savita said, I have 5 rupees and 75 paise. Shama said, I have 7 rupees
and 50 paise.
They knew how to write rupees and paise using decimals.
So Savita
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CHAPTER 3
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COORDINATE GEOMETRY
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Whats the good of Mercators North Poles and Equators, Tropics, Zones and
Meridian Lines? So the Bellman would cry; and crew would reply They are
merely conventional signs!
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LEWIS CARROLL,
Chapter 11
Algebra
11.1 Introduction
Our study so far has been with numbers and shapes. We have learnt numbers,
operations on numbers and properties of numbers. We applied our knowledge
of numbers to various problems in our life. The branch of mathematics
Chapter 4
Basic Geometrical
Ideas
4.1 Introduction
Geometry has a long and rich history. The term Geometry is the English
equivalent of the Greek word Geometron. Geo means Earth and metron
means Measurement. According to
historians, the geometrical ideas
Chapter 13
Symmetry
13.1 Introduction
Symmetry is quite a common term used in day to day life. When we see
certain figures with evenly balanced proportions, we say, They are
symmetrical.
Tajmahal (U.P.)
Thiruvannamalai (Tamil Nadu)
These pictures of archi
Chapter 9
Data Handling
9.1 Introduction
You must have observed your teacher recording the attendance of students in
your class everyday, or recording marks obtained by you after every test or
examination. Similarly, you must have also seen a cricket scor
Chapter 6
Integers
6.1 Introduction
Sunitas mother has 8 bananas. Sunita has to
go for a picnic with her friends. She wants to
carry 10 bananas with her. Can her mother
give 10 bananas to her? She does not have
enough, so she borrows 2 bananas from her
ne
MATHEMATICS
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CONSTRUCTIONS
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11.1 Introduction
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In earlier chapters, the diagrams, which were necessary to prove a theorem or solving
exercises were not necessarily precise. They were drawn only to give you
113
The Triangle and
its Properties
6.1 INTRODUCTION
A triangle, you have seen, is a simple closed curve made of three line
segments. It has three vertices, three sides and three angles.
Here is ABC (Fig 6.1). It has
Fig 6.1
Sides:
AB , BC , CA
Angles:
BA
Practical
Geometry
10.1 INTRODUCTION
You are familiar with a number of shapes. You learnt how to draw some of them in the earlier
classes. For example, you can draw a line segment of given length, a line perpendicular to a
given line segment, an angle, an
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7.1 Introduction
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TRIANGLES
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You have studied about triangles and their various properties in your earlier classes.
You know that a closed figure formed by three intersecting lines is called a triangle.
(Tri m
Lines and
Angles
5.1 INTRODUCTION
You already know how to identify different lines, line segments and angles in a given
shape. Can you identify the different line segments and angles formed in the following
figures? (Fig 5.1)
(i)
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Chapter 5
LINES AND AN
EXPONENTS
AND
POWERS
193
12
CHAPTER
Exponents and Powers
12.1 Introduction
Do you know?
Mass of earth is 5,970,000,000,000, 000, 000, 000, 000 kg. We have
already learnt in earlier class how to write such large numbers more
conveniently using exponents, a
Chapter 2
Whole
Numbers
2.1 Introduction
As we know, we use 1, 2, 3, 4,. when we begin to count. They come naturally
when we start counting. Hence, mathematicians call the counting numbers as
Natural numbers.
Predecessor and successor
Given any natural nu
Congruence of
Triangles
7.1 INTRODUCTION
You are now ready to learn a very important geometrical idea, Congruence. In particular,
you will study a lot about congruence of triangles.
To understand what congruence is, we turn to some activities.
DO THIS
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Chapter 10
Mensuration
10.1 Introduction
When we talk about some plane figures as shown below we think of their
regions and their boundaries. We need some measures to compare them. We
look into these now.
10.2 Perimeter
Look at the following figures (Fig.
Algebraic
Expressions
12.1 INTRODUCTION
We have already come across simple algebraic expressions like x + 3, y 5, 4x + 5,
10y 5 and so on. In Class VI, we have seen how these expressions are useful in formulating
puzzles and problems. We have also seen ex
Fractions and
Decimals
2.1 INTRODUCTION
You have learnt fractions and decimals in earlier classes. The study of fractions included
proper, improper and mixed fractions as well as their addition and subtraction. We also
studied comparison of fractions, equ
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CHAPTER 6
LINES AND ANGLES
6.1 Introduction
In Chapter 5, you have studied that a minimum of two points are required to draw a
line. You have also studied some axioms and, with the help of these axioms, you
proved some ot
Exponents and
Powers
13.1 INTRODUCTION
Do you know what the mass of earth is? It is
5,970,000,000,000,000,000,000,000 kg!
Can you read this number?
Mass of Uranus is 86,800,000,000,000,000,000,000,000 kg.
Which has greater mass, Earth or Uranus?
Distance
1.1 INTRODUCTION
We have learnt about whole numbers and integers in Class VI.
We know that integers form a bigger collection of numbers
which contains whole numbers and negative numbers. What
other differences do you find between whole numbers and
integer
Simple
Equations
4.1 A MIND-READING GAME!
The teacher has said that she would be starting a new chapter in
mathematics and it is going to be simple equations. Appu, Sarita
and Ameena have revised what they learnt in algebra chapter in
Class VI. Have you?
57
Chapter 3
DATA HANDLING
Data
Handling
3.1 INTRODUCTION
In your previous classes, you have dealt with various types of data. You have learnt to
collect data, tabulate and put it in the form of bar graphs. The collection, recording and
presentation of da
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CIRCLES
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10.1 Introduction
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You may have come across many objects in daily life, which are round in shape, such
as wheels of a vehicle, bangles, dials of many clocks, coins of denominations 50
LINEAR EQUATIONS
IN
ONE VARIABLE
21
Linear Equations in
One Variable
2.1 Introduction
In the earlier classes, you have come across several algebraic expressions and equations.
Some examples of expressions we have so far worked with are:
5x, 2x 3, 3x + y,
Visualising Solid
Shapes
15.1 INTRODUCTION: PLANE FIGURES
AND
SOLID SHAPES
In this chapter, you will classify figures you have seen in terms of what is known as dimension.
In our day to day life, we see several objects like books, balls, ice-cream cones e
Perimeter and
Area
11.1 INTRODUCTION
In Class VI, you have already learnt perimeters of plane figures and areas of squares and
rectangles. Perimeter is the distance around a closed figure while area is the part of plane or
region occupied by the closed fi