PPT: Large Numbers Around Us | PPTs for Class 7 PDF Download

 Page 1


Large Numbers Around Us
Page 2


Large Numbers Around Us
I n t r o d u c t i o n
Have you ever wondered how many people live in a city or how far the Moon is from Earth? 
Numbers help us understand such things4and sometimes, those numbers are really big!
In everyday life, we use small numbers like 10 or 1,000. But for things like country populations 
or space distances, we need huge numbers4like lakhs and crores.
Once, a farmer named Eshwarappa heard that there were one lakh varieties of rice in India. He 
thought, "If I try one every day, would I finish in a lifetime?"
In this chapter, you'll explore big numbers4how to read, write, and use them to understand our 
amazing world.
Page 3


Large Numbers Around Us
I n t r o d u c t i o n
Have you ever wondered how many people live in a city or how far the Moon is from Earth? 
Numbers help us understand such things4and sometimes, those numbers are really big!
In everyday life, we use small numbers like 10 or 1,000. But for things like country populations 
or space distances, we need huge numbers4like lakhs and crores.
Once, a farmer named Eshwarappa heard that there were one lakh varieties of rice in India. He 
thought, "If I try one every day, would I finish in a lifetime?"
In this chapter, you'll explore big numbers4how to read, write, and use them to understand our 
amazing world.
How Big is a Lakh?
Eshwarappa, a farmer from Karnataka, hears 
about one lakh (1,00,000) varieties of rice 
once grown in India.
If someone tastes 3 new rice varieties daily, 
how long would it take to try them all?
3 varieties/day × 365 days/year × 100 years = 
109,500 varieties
Even over a century, tasting 3 varieties daily 
just surpasses one lakh. This illustrates how 
vast 1,00,000 truly is!
Page 4


Large Numbers Around Us
I n t r o d u c t i o n
Have you ever wondered how many people live in a city or how far the Moon is from Earth? 
Numbers help us understand such things4and sometimes, those numbers are really big!
In everyday life, we use small numbers like 10 or 1,000. But for things like country populations 
or space distances, we need huge numbers4like lakhs and crores.
Once, a farmer named Eshwarappa heard that there were one lakh varieties of rice in India. He 
thought, "If I try one every day, would I finish in a lifetime?"
In this chapter, you'll explore big numbers4how to read, write, and use them to understand our 
amazing world.
How Big is a Lakh?
Eshwarappa, a farmer from Karnataka, hears 
about one lakh (1,00,000) varieties of rice 
once grown in India.
If someone tastes 3 new rice varieties daily, 
how long would it take to try them all?
3 varieties/day × 365 days/year × 100 years = 
109,500 varieties
Even over a century, tasting 3 varieties daily 
just surpasses one lakh. This illustrates how 
vast 1,00,000 truly is!
When a Lakh Doesn't Seem So Big
Giant Cricket Stadium
The giant cricket stadium in 
Ahmedabad can seat more 
than one lakh people! Imagine 
fitting the entire 2024 
population of Chintamani into 
that stadium. Suddenly, one 
lakh feels more contained.
Hairs on Your Head
Think about the hairs on your 
head 3 most people have 
between 80,000 and 1,20,000 
hairs. That's around one lakh 
hairs fitting in the small space 
of your scalp!
Fish Eggs
And in nature, some fish lay 
almost one lakh eggs at once. 
So, whether a lakh feels 'big' or 
'small' really depends on the 
context!
Page 5


Large Numbers Around Us
I n t r o d u c t i o n
Have you ever wondered how many people live in a city or how far the Moon is from Earth? 
Numbers help us understand such things4and sometimes, those numbers are really big!
In everyday life, we use small numbers like 10 or 1,000. But for things like country populations 
or space distances, we need huge numbers4like lakhs and crores.
Once, a farmer named Eshwarappa heard that there were one lakh varieties of rice in India. He 
thought, "If I try one every day, would I finish in a lifetime?"
In this chapter, you'll explore big numbers4how to read, write, and use them to understand our 
amazing world.
How Big is a Lakh?
Eshwarappa, a farmer from Karnataka, hears 
about one lakh (1,00,000) varieties of rice 
once grown in India.
If someone tastes 3 new rice varieties daily, 
how long would it take to try them all?
3 varieties/day × 365 days/year × 100 years = 
109,500 varieties
Even over a century, tasting 3 varieties daily 
just surpasses one lakh. This illustrates how 
vast 1,00,000 truly is!
When a Lakh Doesn't Seem So Big
Giant Cricket Stadium
The giant cricket stadium in 
Ahmedabad can seat more 
than one lakh people! Imagine 
fitting the entire 2024 
population of Chintamani into 
that stadium. Suddenly, one 
lakh feels more contained.
Hairs on Your Head
Think about the hairs on your 
head 3 most people have 
between 80,000 and 1,20,000 
hairs. That's around one lakh 
hairs fitting in the small space 
of your scalp!
Fish Eggs
And in nature, some fish lay 
almost one lakh eggs at once. 
So, whether a lakh feels 'big' or 
'small' really depends on the 
context!
Reading and Writing Large Numbers
The Indian Place Value System
Units
The first three digits from the right are the units, tens, and hundreds.
Thousands
The next two digits are the thousands.
Lakhs
The next two digits are the lakhs.
Crores
The digits after lakhs are the crores.
In the Indian system, numbers are grouped into hundreds, thousands, lakhs, crores, and so on. Using commas correctly is key for reading 
and writing large numbers clearly.