Page 13 - ICSE Math 5

International Number System

The International number system is used worldwide to read and write large number.

According to the International number system, we divide the large numbers into different periods:
the ones period, the thousands period and the millions period.
The place value chart of the International number system is shown.

PERIODS MILLIONS THOUSANDS ONES

Place Hundred Ten Millions Hundred Ten Thousands Hundreds Tens Ones
Values Millions Millions Thousands Thousands
(HM) (TM) (M) (HTh) (TTh) (Th) (H) (T) (O)

Let’s consider the number 618345215 and read it according to the International number system.
This number can be divided into periods as follows.
• Ones period: This is the first group. It consists of ones, tens and hundreds. 618345215
• Thousands period: The second group consists of the next three digits, i.e., thousands, ten
thousands and hundred thousands. 618345215

• Millions period: The millions period consists of the next three digits, i.e., millions, ten
millions and hundred millions. 618345215

PERIODS MILLIONS THOUSANDS ONES

Place Hundred Ten Millions Hundred Ten Thousands Hundreds Tens Ones
Values Millions Millions Thousands Thousands
(HM) (TM) (M) (HTh) (TTh) (Th) (H) (T) (O)
618345215 6 1 8 3 4 5 2 1 5

618,345,215 is read as six hundred eighteen million three hundred forty-five thousand two
hundred fifteen.
Comparison of Indian and International Number Systems

Indian Number System International Number System

• The ones period has 3 places and the • All the periods have 3 places each.
other periods have 2 places each.

• Starting from the extreme right, first • Starting from the extreme right, commas
rd
comma is placed after the 3 digit, and then are placed after every three digits.
commas are placed after every two digits.

• Place values of the digits are ones, tens, • Place values of the digits are ones, tens,
hundreds, thousands, ten thousands, hundreds, thousands, ten thousands,
lakhs, and so on. hundred thousands, millions, and so on.

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