7 Digit Numbers
7digit numbers are those numbers that start from 1000000 and end at 9999999. Do you know how many zeros are there in a million? Let us see. 10 ones make a ten, 10 tens make a hundred, 10 hundreds make a thousand, 10 thousands make a tenthousand, 10 tenthousands make a hundredthousand and 10 hundredthousands make a million. In this lesson, let us learn about numbers up to 7 digits, place values in 7digit numbers, how to decompose 7digit numbers, and the comparison of the Indian number system and the International number system.
What are Numbers Up to 7 Digits?
When we talk about 7digit numbers, we mean the place values up to 1,000,000 or 10,00,000. The place value of the seven digits that make up the 7digit number is obtained by progressively multiplying the respective figure by 1, 10, 100, 1,000,10,000, 1,00,000, and 10,00,000, starting from the rightmost digit and moving to the left, as per Indian number system.
Let us visualize the following instances with their counts and relate the digits that they come up to.
Instances  Number of digits 

A dozen eggs (12)  2digits 
A cricketer scoring a century (100)  3digits 
Number of minutes in a day (1440)  4digits 
Number of seconds in a day (86,400)  5digits 
The population of a particular area of a city (768,543)  6digits 
The population of metropolitan cities (4,598,765)  7digits 
The following chart shows how each digit is termed according to its place value. According to the chart, we can see that if we have a 7digit number, it starts with one million.
7digit Numbers in the Indian System and the International System
7digit numbers can be expressed in two ways. The first is as per the Indian place value chart and the other is as per the International place value chart. The following table shows how a number is expressed in two different ways.
System  Indian System  International System 

Number  52,90,329  5,290,329 
Placing of commas  2:2:3  3:3:3 
Standard Form  Fiftytwo lakh, ninety thousand, three hundred twentynine  Five million, two hundred ninety thousand, three hundred twentynine 
Indian System vs International System
Let us learn how the numbers are compared in both the systems of numeration with the help of this chart given below. The chart also shows the place values of 7digit numbers in both the systems, the Indian place value system and the International place value system.
Place Values in 7Digit Numbers
According to the Indian numeral system, the place values of 7digit numbers, starting from the right side, are read as, ones, tens, hundreds, thousands, ten thousands, lakhs, and so on. Whereas in the International system, we have ones, tens, hundreds, thousands, ten thousands, hundred thousands, and millions. As seen in the chart given above, we can see the place values of the Indian number system and the International number system for 7digit numbers.
If we compare the tables given above, we can conclude that 10 lakh = 1 million. Let us understand this with the decomposition of 7digit numbers in the following section.
How to Decompose 7Digit Numbers?
A 7digit number has place values up to ten lakh or a million. Consider the number 5290329. Let us decompose it in both the systems of numeration. The following table shows the different ways in which it is placed in both systems.
Indian System  Number  International System 

Ten Lakh  5  Million 
Lakh  2  Hundred Thousands 
Ten Thousands  9  Ten Thousands 
Thousands  0  Thousands 
Hundreds  3  Hundreds 
Tens  2  Tens 
Ones  9  Ones 
As per the Indian system:
Let us decompose the same number 5290329 according to the Indian system of numeration.
= (5 × 10 lakh) + (2 × lakh) + (9 × ten thousands) + (0 × thousands) + (3 × hundreds) + (2 × tens) + (9 × ones)
= (5 × 10,00,000) + (2 × 1,00,000) + (9 × 10,000) + (0 × 1000) + (3 × 100) + (2 × 10) + (9 × 1)
= 50,00,000 + 2,00,000 + 90,000 + 0 + 300 + 20 + 9 = 52,90,329
As per the International system:
Let us decompose the same number 5290329 according to the International system of numeration.
= (5 × million) + (2 × hundredthousands) + (9 × tenthousands) + (0 × thousands) + (3 × hundreds) + (2 × tens) + (9 × ones)
= (5 × 1,000,000) + (2 × 100,000) + (9 × 10,000 ) + (0 × 1000) + (3 × 100) + (2 × 10) + (9 × 1)
= 5,000,000 + 200,000 + 90,000 + 0 + 300 + 20 + 9 = 5,290,329
Tips and Tricks
The following points can be noted while solving problems related to 7digit numbers.
 '1 million' or '10 Lakhs' is 1 followed by 6 zeros. All other larger or smaller numbers can then be written with reference to these two numbers.
 From the right, place the commas, decompose the number according to its place value and read the number in both the systems of numeration.
Smallest 7 Digit Number
The smallest 7 digit number is 1000000 because 7digit numbers start from here. It is read as one million as per the International place value chart and ten lakh as per the Indian place value chart.
Largest 7 Digit Number
The largest 7 digit number is 9999999 because the number that comes after this is 10000000 which is an 8digit number. 9999999 is read as ninetynine lakh, ninetynine thousand, nine hundred and ninetynine.
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Examples on 7 Digit Numbers

Example 1: Find the difference between the greatest 7digit number and the smallest 6digit number. Write the predecessor and successor of the result obtained.
Solution:
The greatest 7digit number is 99,99,999. The smallest 6digit number is 1,00,000. Their difference is 99,99,999 1,00,000 = 98,99,999. The predecessor of 98,99,999 is the number that comes just before it, and it is 98,99,998. The successor of 98,99,999 is the number that comes just after it, and it is 99,00,000.

Example 2: How is the number 4315003 separated with commas and read in the Indian Place Value System and the International Place value system?
Solution:
 The Indian System separates this number by adding commas in this way: 43,15,003. This is read as Fortythree lakh, fifteen thousand and three.
 The International System separates these numbers by adding commas in this way: 4,315,003. This is read as Four million, three hundred and fifteen thousand, and three.

Example 3: Write the following 7digit number in the expanded form (Indian System): 4380219
Solution:
 4380219 can be expanded in three forms:
 4380219 = 4 ten lakhs + 3 lakhs + 8 ten thousands + 0 thousands + 2 hundreds + 1 tens + 9 ones
 4380219 = (4 × 10,00,000) + (3 × 1,00,000) + (8 × 10,000) + (0 × 1000) + (2 × 100) + (1 × 10) + (9 × 1)
 4380219 = 40,00,000 + 3,00,000 + 80,000 + 0 + 200 + 10 + 9
FAQs on Numbers Upto 7Digits
What is a 7Digit Number?
A 7 digit number is a number that has 7 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 ten lakh (10,00,000) and goes up to Ninetynine lakh, ninetynine thousand, nine hundred and ninetynine (99,99,999).
What is the Smallest 7Digit Number?
The smallest 7 digit number is 10,00,000 which is read as ten lakh according to the Indian number system and 1,000,000 (one million) as per the International number system.
What is the Greatest 7Digit Number?
The greatest 7 digit number is 99,99,999 which is read as Ninetynine lakh, ninetynine thousand, nine hundred and ninetynine, as per the Indian number system.
How Many 7Digit Numbers are there in all?
7digit numbers start from 1000000 and end with 9999999. There are ninety lakh (90,00,000) 7digit numbers in all.
How Much is a 7Digit Number?
A 7digit number has seven digits, where the first digit is 1 or more than 1, and all the digits after the first digit can be anything between 09, including both. It starts from ten lakh (10,00,000) and goes up to Ninetynine lakh, ninetynine thousand, nine hundred and ninetynine (99,99,999)
What is the Difference Between the Greatest and the Smallest 7Digit Numbers?
The smallest 7digit number is 10,00,000 and the greatest 7digit number is 99,99,999. Thus, the difference between the greatest and the smallest 7digit numbers is 99,99,999 10,00,000 = 89,99,999.
How to Write a 7Digit Number in the Expanded Form?
A 7digit number can be written in the expanded form as per the place value of each of the digit in that number. For example, 99,88,913 = 90,00,000 + 9,00,000 + 80,000 + 8,000 + 900 + 10 + 3.
What is the Successor of the Greatest 7 Digit Number?
The successor of the greatest 7 digit number is 10,000,000 (ten million). We know that the greatest 7digit number is 9,999,999 and its successor is the number that comes right after it.
What is the Predecessor of the Largest 7 Digit Number?
The predecessor of the largest 7 digit number is 9,999,998. We know that the largest 7 digit number is 9,999,999 and its predecessor is the number that comes just before it.
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