In this mini lesson, we will explore the world of numbers upto 6digits. We will walk through the Indian and International numbering systems for the numbers upto 6digits, see how to decompose them, clear misconceptions and discover an interesting 6digit number.
Hey Friends! Can you write the population of the state where you live in number form? How about writing down the price of your favourite car in the number form as well?
When you buy a car or count a state's population you will look at six and seven digit numbers. This video introduces you to the world of one lakh.
We are excited to have you in the journey of 6digit numbers. Let's get going!
Lesson Plan
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What are Numbers up to 6Digits?
In the 6digit numbers, the highest place value is 1,00,000 which has a unique name in the Indian number system – a lakh.
A lakh is 1 followed by 5 zeros and is the smallest possible 6digit number.
It is essential to understand the Indian numbering system at this stage because from the next higher place value (or next higher power of ten), the International numbering system would also be used, so the difference must be made clear.
There are three special numbers in the Indian numbering system – lakh, crore, and arab.
One lakh in numbers is written as 1,00,000 ; a crore is equal to a hundred lakhs and is expressed as 1,00,00,000
An arab is 100 crores and is expressed as 1,00,00,00,000
When we move to a greater number of digits in the following modules, we will also touch upon the International numbering system.
For now, it will suffice to understand that there is no particular name for a lakh in the International system, and it is simply referred to as a hundred thousand.
Commas in 6Digit Numbers
Based on the details given above, you can understand that as per the Indian numbering system, there would be two commas used in any six digit number.
The first would demarcate the first three digits (from right) to show how many thousands there are, and the next would come after the first 5 digits from the right to show how many lakhs there are in the number.
For example, you would write 372672 as 3,72,672 to mean that the number has 3 lakhs, 72 thousands, 6 hundreds, 7 tens and 2 ones.
Let's proceed to learn how do we decompose a 6digit number.
Learn These Along with Numbers Upto 6digits
Here are a few more lessons related to numbers upto 6digits.
These topics will not only help you master the concept for numbers upto 6digits, but also other topics related to it.
Click on any of the mini lessons you want to explore! 
Indian Numeral System 
Numbers upto 4digits 
Numbers upto 5digits 
Numbers upto 7digits 
Numbers upto 9digits 
Indian Place Value Chart 
How to Decompose 6Digit Numbers?
Like we said at the start, a six digit number has place values up to a lakh.
These are the names of the place values (starting from the right) in a six digit number:
 Digit 1Units
 Digit 2Tens
 Digit 3Hundreds
 Digit 4Thousands
 Digit 5Ten Thousands
 Digit 6Lakhs
So let us take a random six digit number like 528497, and see how it gets decomposed.
Here PV stands Place Value,
Digit 1 PV = 7 × 1  7 
Digit 2 PV = 9 × 10  90 
Digit 3 PV = 4 × 100  400 
Digit 4 PV = 8 × 1000  8000 
Digit 5 PV = 2 × 10000  20000 
Digit 6 PV = 5 × 100000  500000 
Have a look at another 6digit number 2,31,273 and observe carefully its decomposition.
Hope we helped you to clear your concepts on 6digit numbers. Let's continue to learn more.
The Significance of Zero in 6Digit Numbers
Any zero which does not have any nonzero number to its right does not count in the digits of the 6digit number.
Take, for example, two 6digit numbers 023843 and 002305.
In both these numbers, the 6^{th} number on the extreme left does not have any further non zero number to its left.
Additionally, in 002305, the 5^{th} number from the right also does not have any further non zero number to its left.
So for 002305, the two numbers on the left extreme are without any value.
So the two numbers can actually be written as 23843 (which makes it a 5digit number) and 2305 (which makes it a 4digit number).
We are sure the next section which deals with an interestind 6digit number, will add to your understanding about these large numbers.
Want to know how a 5digit number changes to a 6digit number? The largest 5digit number is 99,999
We are going to illustrate 99,999 through abacus and demonstrate how adding a bead at ones place brings changes in the place value of other beads.
See the transformation of 5digit number to 6digit number.
Sounds interesting? Press the Play button to begin.
Click RESET and PLAY in the simulation shown below to see it happen.
An interesting 6digit number
As you continue to explore your way around the exciting world of numbers, you will come across a number which usually is written using 6 digits (although shorter versions are also used).
This number is called Pi (pronounced as Pie) and is represented as 3.14159 and the Greek letter \(\pi\).
It is defined as the ratio between a circle’s circumference and its diameter.
So, if the diameter is D, and circumference is C, then \(C = \pi D\).
In more simple terms, it is the ratio of the number 22 and the number 7
Although it is usually represented by six digits (and sometimes even smaller versions like 3.14 or 3.142), it is theoretically possible to have infinite digits in this number.
Now we come to the interesting part.
Instead of \(\begin{align}\frac{22}{7}\end{align}\), let us consider \(\begin{align}\frac{1}{7}\end{align}\)
This number \(\begin{align}\frac{1}{7}\end{align}\) is another cyclic number (it has infinite numbers after the decimal point), but we usually write it as 0.142857
Here are some amazing facts about 0.142857

When you multiply these 6 digits 142857 by 7, you get 999999

It is even more interesting to note that the same set of digits get repeated when you multiply 142857 by the numbers 1 through 6

\(\begin{align}\!142857\! \times \!2 = \!285714\!\end{align}\)

\(\begin{align}\!142857 \!\times \!3 = \!428571\!\end{align}\)

\(\begin{align}\!142857 \!\times \!4 = \!571428\!\end{align}\)

\(\begin{align}\!142857\! \times \!5 = \!714285\!\end{align}\)

\(\begin{align}\!142857 \!\times\! 6 = \!857142\!\end{align}\)
What are the Common Mistakes or Misconceptions?

Misconception: "One hundred thousand" and "one lakh" are two different numbers.
In India, children are taught to name numbers based on both the Indian naming system and the International naming system.
So, 100,000 is written as “One hundred thousand” as per the International naming system but “One lakh” as per the Indian system.  Children tend to make mistakes when placing commas in numbers of 6 or more digits.
This once again happens because of two conventions  the Indian system and the International system.
Here children should build comfort writing the same number in both systems. Targeted practice helps.
Let's now understand how can we write a 6digit number in Indian as well as International System.
How to Write A 6digit Number In Indian System and the International System?
Create a Chart with All the Place Names Listed
Let children see how till tenthousand the naming convention is the same.
But for 6 digits or higher the same number has two names.
The choice of names does not change the value of the number.
“One lakh” and “one hundred thousand” are equal (have the same value).
 Tip: Remember the zeros for two large numbers and all other larger or smaller numbers can then be written with reference to these two numbers.
"one crore" is 1 followed by 7 zeros.
And "1 million" is 1 followed by 6 zeros.  Trick: If we want to round off say 4,63,859 to the nearest thousand then underline all digits that are in the lower place values (ones, tens and hundreds, in this example).
Then replace those digits with zero, while doing this check the highest place value we are replacing (hundreds place i.e 8 in this example).
If that is 5 or higher, increase the thousands place by one.
So the rounded off number will become 4,64,000
Let's get ready to solve some interesting questions based on what we have learnt so far.
Solved Examples
Example 1 
Using the Indian place value system, identify and write the number and its number name with the help of the shapes and blocks representing them.
Solution:
The number name of 4,23,869 is Four lakh, twenty three thousand, eight hundred and sixty nine.
The number is 4,23,869 
Example 2 
There are 6 balloons with numbers printed on them.
Arrange these numbers to find the greatest 6digit number without repeating any digit.
Solution:
For the greatest number, the digit in the lakhs place will be the greatest: 9
Now the other numbers will be arranged in descending order: 9,87,532
The greatest number is 9,87,532 
Example 3 
How is the number 249132 indicated with commas and read in the Indian place value system and the International place value system?
Solution:
The Indian system separates these numbers by adding commas in this way: 2,49,132
This is read as Two lakh, forty nine thousand, one hundred and thirty two.
The International system separates these numbers by adding commas in this way: 2,49,132
This is read as Two hundred forty nine thousand, one hundred and thirty two.
Example 4 
Find the difference between the largest 6digit number and the smallest 4digit number and find its predecessor.
Solution:
The largest 6digit number is 9,99,999
The smallest 4digit number is 1000
Their difference is: \(9,99,999\! \! \!1000\! =\! 9,98,999\)
The predecessor of the difference is \(9,98,998\)
Example 5 
Identify the two numbers shown in the abacus and calculate their sum.
Solution:
The number shown in the first abacus: 4,12,634
The number shown in the second abacus: 1,50,702
Their sum is: \(\ 4,12,634 + 1,50,702 \)=\( 5,63,336\)
The sum is 5,63,336 
1. 100 lakhs make a crore.
2. The greatest 6digit number is 9,99,999 which is read as Nine lakh, ninetynine thousand, nine hundred and ninetynine.
3. Interesting fact : On cheques, we write the amount in both ways (In digits as well as in words).
Example: Two lakh is written as Rs. 2,00,000 in the number space provided; and 'Rupees Two lakh only' is written as words in the line below.
Interactive Questions On Numbers upto 6Digits
Here are a few activities for you to practice. Select/Type your answer and click the "Check Answer" button to see the result.
Let’s Summarize
The minilesson was aimed at helping you learn about composite numbers and their characteristics. Hope you enjoyed learning about them and exploring various types of composite numbers.
We would love to hear from you. Drop us your comments in the chat and we would be happy to help.
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Frequently Asked Questions (FAQs)
1. What is a 6digit number?
A 6digit number is a number which has 6 digits, where the first digit should be 1 or greater than 1 and the rest of the digits can be any number between 09
It starts from one lakh (1,00,000) and goes up to Nine lakh, ninetynine thousand, nine hundred and ninety nine (9,99,999).
2. How many 6digit numbers are there?
There are nine lakh (9,00,000) 6digit numbers in all.
3. How do you write 6digit numbers in words?
Let's take a 6digit number 5,46,783. According to the Indian place value system, it is written as Five lakh, fortysix thousand, seven hundred and eightythree.
4. What is the smallest 6digit number?
The smallest 6digit number is 1,00,000