Learning Objectives
● To express numbers in the exponential form.
● To understand the laws of exponents.
● To find the unit digit of numbers represented in exponential form.
● To know about the degree of expressions.

__Chapter 3__

__ALGEBRA__

** **

**Learning Objectives**

● To express numbers in the exponential
form.

● To understand the laws of exponents.

● To find the unit digit of numbers represented
in exponential form.

● To know about the degree of expressions.

__Introduction__

Teacher asked students to tell the largest
number known to them.

They called out numbers like, ‘Thousand’,
‘Lakh’, ‘Million’, ‘Crore’ and so on. Finally, Kumaran was declared as winner with
his number ‘Thousand lakh crore’.

All the students clapped. The teacher
also honoured Kumaran and he was extremely happy.

But, everything came to an end as the
teacher asked him to write his number on the blackboard. With great difficulty of
counting the zeros several times, he wrote as 1000000000000000. Is it correct?

Now, the teacher wrote another five zeros
on the right of the number and threw the open challenge to read the number. Of course,
there was an absolute silence in the classroom.

Dealing with big numbers is not so easy.
Isn’t it? But, we do use very big numbers in reality? Here are few examples where
we use large numbers in real life situations.

● The distance between the Earth and
the Sun is 149600000000 m.

● Mass of the Earth is 5970000000000000000000000
*kg*.

● The speed of light is 299792000 m/sec.

● Average radius of the Sun is 695000
km.

● The distance between Moon and the Earth
is 384467000 m.

There exists a simple and nice way to
represent such numbers. To know that we need to learn about exponents.

Tags : Term 2 Chapter 3 | 7th Maths , 7th Maths : Term 2 Unit 3 : Algebra

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