7 Digit Numbers
7-digit 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 ten-thousand, 10 ten-thousands make a hundred-thousand and 10 hundred-thousands make a million. In this lesson, let us learn about numbers up to 7 digits, place values in 7-digit numbers, how to decompose 7-digit 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 7-digit 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 7-digit 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) | 2-digits |
| A cricketer scoring a century (100) | 3-digits |
| Number of minutes in a day (1440) | 4-digits |
| Number of seconds in a day (86,400) | 5-digits |
| The population of a particular area of a city (768,543) | 6-digits |
| The population of metropolitan cities (4,598,765) | 7-digits |
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 7-digit number, it starts with one million.
7-digit Numbers in the Indian System and the International System
7-digit 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 | Fifty-two lakh, ninety thousand, three hundred twenty-nine | Five million, two hundred ninety thousand, three hundred twenty-nine |
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 7-digit numbers in both the systems, the Indian place value system and the International place value system.
Place Values in 7-Digit Numbers
According to the Indian numeral system, the place values of 7-digit 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 7-digit numbers.
If we compare the tables given above, we can conclude that 10 lakh = 1 million. Let us understand this with the decomposition of 7-digit numbers in the following section.
How to Decompose 7-Digit Numbers?
A 7-digit 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 × hundred-thousands) + (9 × ten-thousands) + (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 7-digit 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 7-digit 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 8-digit number. 9999999 is read as ninety-nine lakh, ninety-nine thousand, nine hundred and ninety-nine.
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FAQs on Numbers Upto 7-Digits
What is a 7-Digit 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 0-9. It starts from ten lakh (10,00,000) and goes up to Ninety-nine lakh, ninety-nine thousand, nine hundred and ninety-nine (99,99,999).
What is the Smallest 7-Digit 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 7-Digit Number?
The greatest 7 digit number is 99,99,999 which is read as Ninety-nine lakh, ninety-nine thousand, nine hundred and ninety-nine, as per the Indian number system.
How Many 7-Digit Numbers are there in all?
7-digit numbers start from 1000000 and end with 9999999. There are ninety lakh (90,00,000) 7-digit numbers in all.
How Much is a 7-Digit Number?
A 7-digit 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 0-9, including both. It starts from ten lakh (10,00,000) and goes up to Ninety-nine lakh, ninety-nine thousand, nine hundred and ninety-nine (99,99,999)
What is the Difference Between the Greatest and the Smallest 7-Digit Numbers?
The smallest 7-digit number is 10,00,000 and the greatest 7-digit number is 99,99,999. Thus, the difference between the greatest and the smallest 7-digit numbers is 99,99,999 -10,00,000 = 89,99,999.
How to Write a 7-Digit Number in the Expanded Form?
A 7-digit 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 7-digit 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.