Billion
Billion is a very large number that is 1 followed by 9 zeros. It is also known as a thousand millions as 1,000 × 1000,000 = 1000,000,000. The prefix "giga" in the word 'gigameter' refers to billion, which means 1 gigameter is nothing but a billion meters. Billion has two notations, one is 10^{9} which is followed in the American system and the other one is 10^{12} or 1 followed by 12 zeros which is followed in many nonAmerican countries like French and Germany.
1.  What is a Billion? 
2.  Technique to Remember Zeroes in Billion 
3.  Difference Between Billion, Million, and Trillion 
4.  Solved Examples on Billion 
5.  Practice Questions on Billion 
6.  FAQs on Billion 
What is a Billion?
In number systems, when you start counting numbers from 0 to 9, 9 to 99, 100 to 999, and so on, you will observe that as you move forward, you will be introduced to 5 digits, 6 digits, 10 digits numbers, and similar higher numbers. A billion is a 10digit number formed by 1 followed by 9 zeros.
Definition of Billion
A billion is defined as a tendigit number. It is counted after 100 million and carries forward the chain towards trillions. It is represented as 10^{9}, which is the smallest 10digit number in math.
Technique to Remember Zeroes in Billion
1 billion is written as 1,000,000,000 and can be represented in two forms.
Difference Between Billion, Million, and Trillion
As you know in a number system, counting is always in increasing order. So, the increasing order here is million, billion, and trillion. That means, when we multiply 1000 to million, we get billion. Similarly, when we multiply 1000 to a billion, we get a trillion. The basic difference between trillion, billion, and million is visible in the image below:
Trillion
A trillion is a million times million which can be written as 1,000,000 × 1,000,000 =1,000,000,000,000. In scientific notation, it is represented as 1 × 10^{12}. It can also be treated as a thousand billion. In simple words, it has 12 zeroes.
Million
A million is a thousand times thousand which can be written as 1,000 × 1,000 = 1,000,000. In scientific notation, it is represented as 1 × 10^{6}. In simple words, it has 6 zeroes. The basic flow between the place value of the digits and how the chain goes on is shown below:
Think Tank:
1) Find out what these numbers would be called:
a) 10^{21}
b) 10^{24}
c) 10^{27}
d) 10^{33}
2) Try to write these numbers in the expanded form.
a) 7,826,657,098
b) 8,013,973,083
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Solved Examples on Billion

Example 1: Write the following numbers in expanded sentence form.
a) 2,111,086,721
b) 8,012,973,082
Solution:
a) 2,111,086,721 = Two billion one hundred eleven million eightysix thousand seven hundred and twentyone.
b) 8,012,973,082 = Eight billion twelve million nine hundred and seventythree thousand eightytwo. 
Example 2: Write the number 9,813,623,083 in the following expanded forms:
a) Notation form
b) Factors form
c) Exponential form
d) Word form
Solution:a) Notation form
9,813,623,083 = 9,000,000,000 + 800,000,000 + 10,000,000 + 3,000,000 + 600,000 + 20,000 + 3,000 + 0 + 80 + 3
b) Factors form
9,813,623,083 = 9 × 1,000,000,000 +8 × 100,000,000 +1 × 10,000,000 + 3 × 1,000,000 + 6 × 100,000 + 2 × 10,000 + 3 × 1,000 + 0 × 100 + 8 × 10 + 3 × 1
c) Exponential form
9,813,623,083 = 9 × 10^{9} + 8 × 10^{8} + 1 × 10^{7} + 3 × 10^{6} + 6 × 10^{5} + 2 × 10^{4} + 3 × 10^{3} + 0 × 10^{2} + 8 × 10^{1 }+ 3 × 10^{0}
d) Word form
9,813,623,083 = Nine billion eight hundred and thirteen million six hundred and twentythree thousand eightythree
FAQs on Billion
Is 1 Billion Different in the US and UK?
Not anymore; the American figure has been adopted by British English which means a billion equals a thousand million in both versions of English. The same change has been done with a trillion.
How Many Zeroes are in a Billion?
The total number of zeroes in a billion is 9. For example, 1,000,000,000 or 10^{9}.
How Many Millions is 1 Billion?
A billion is 1000 million. So, we have, 1 billion = 1000 × 1 million.
How Many Crores are there in 1 Billion?
There are 100 crores in one billion.
How Many Lakhs Make a Billion?
In 1 million there are 10 lakhs and in 1 billion there are 1000 million. So, in 1 billion there are 10,000 lakhs. Or in other words, ten thousand lakhs make one billion.