# International System of Numeration

The international system is followed by most of the countries of the world. In this system, a number is split up into groups or periods.In the Inter-national System of Numeration, we use ones, tens, hundreds, thousands, millions and billions.

The 1st period consists of ---> ones, tens and hundred.

The 2nd period consists of ---> thousand, 10 thousand and 100 thousands.

The 3rd period consists of ---> million, 10 million and 100 million.

The 4th period consists of ---> billion, 10 billion and 100 billion.

One million is a thousand thousands.

Example : The number 50,801,592 is read as fifty million, eight hundred and one thousand, five hundred and ninety two.

 Billions Millions Thousands Ones 100 B|10 B| 1 B 100 M|10 M| 1 M 100 Ths|10 Ths| 1 Th 100 |10|1

Example : 1)Insert commas in 8643871 and write it in words.

Solution : 8 , 643 , 871 --->Eight million six hundred forty-three thousand eight hundred seventy-one.

Example : 2) Insert commas in 124686 and write it in words.

Solution : 124 , 686 ---->One hundred twenty four thousand six hundred eighty six.

Example : 3) Write "Ten million and seven" in numerals.

Solution : 10 , 000 , 007

Example : 4) How many millions make a billion?

Solution : 1000 millions make a billion.

Example : 5) Write 345,567 in word form

Solution : Three hundred forty five thousand and five hundred sixty-seven

Example : 6) Insert commas in 1234789

Solution : 1,234,789

Note : Commas are used to mark thousands and millions. It comes after every three digits from the right.
The first comma marks thousands and the next comma marks millions.

Number System

International system of numeration
Roman Numbers
Rounding Numbers