Page 13 - Start Up Mathematics_4

10,00,000 = 10 × 1,00,000 = 10 lakhs

= 100 × 10,000 = 100 ten thousands

= 1,000 × 1,000 = 1,000 thousands
= 10,000 × 100 = 10,000 hundreds

= 1,00,000 × 10 = 1,00,000 tens

= 10,00,000 × 1 = 10,00,000 ones

International Number System

The system of writing numbers we have learnt is called the Indian Number System. It is used
only in India. It can further be extended to crores and ten crores. There is another number
system called the International Number System which is used all over the world.
The table below shows the place value and the periods in the International Number
System.

Periods
→ MILLIONS (M) THOUSANDS (Th) ONES (O)
Place Hundred Ten Millions Hundred Ten Thousands Hundreds Tens Ones
Value → Millions Millions Thousands Thousands
(HM) (TM) (M) (HTh) (TTh) (Th) (H) (T) (O)

To read large numbers as per the International Number System, we group them into three
periods. Let’s consider the number 8137546.

1. Start from the extreme right and make a group of three digits. This is the first group.
It consists of ones, tens and hundreds and is called the Ones Period. 8137 546
2. The second group consists of the next three digits, i.e., thousands, ten thousands and
hundred thousands. It is called the Thousands Period. 8 137 546

3. The third group consists of the next three digits, i.e., millions, ten millions and hundred
millions. It is called the Millions Period. 8 137 546

Thus, 8137546 is read as eight million one hundred thirty-seven thousand five hundred
forty-six.

Periods
→ MILLIONS (M) THOUSANDS (Th) ONES (O)
Number Hundred Ten Millions Hundred Ten Thousands Hundreds Tens Ones
Millions Millions Thousands Thousands
(HM) (TM) (M) (HTh) (TTh) (Th) (H) (T) (O)
100,000,000 10,000,000 1,000,000 100,000 10,000 1,000 100 10 1

8,137,546 8 1 3 7 5 4 6

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