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 International 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.




100 B10 B 1 B  100 M10 M 1 M  100 Ths10 Ths 1 Th  100 101 
Example : 1)Insert commas in 8643871 and write it in words.
Solution : 8 , 643 , 871 >Eight million six hundred fortythree thousand eight hundred seventyone.
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 sixtyseven
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