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# Use of commas and Comparison of Number Systems

In our Indian System of Numeration, we use commas from the right. The first comma comes before Hundreds place (3 digits from the right). The second comma comes before Ten Thousands place (5 digits from the right).

Use of commas and Comparison of Number Systems

In our Indian System of Numeration, we use commas from the right. The first comma comes before Hundreds place (3 digits from the right). The second comma comes before Ten Thousands place (5 digits from the right). The third comma comes before Ten Lakh place (7 digits from the right) and represents Crore.

In the International System of Numeration, we use Ones, Tens, Hundreds, Thousands, Ten Thousands, Hundred Thousands, Millions and Billions. Commas are used to mark Thousands, Millions and Billions.

We can easily understand both the Indian and the International Number Systems from the following table.

With the help of the above table, we can read the number 57340000 as 5,73,40,000 (five crore seventy three lakh forty thousand) in the Indian System and as 57,340,000 (fifty seven million, three hundred forty thousand) in the International System.

Now let us discuss simple problems with examples.

Example 1.3

The distance between the Sun and the Earth is about 92900000 miles. Read and write the number in the Indian and the International System by using commas.

Solution

Indian System

i.e., 9,29,00,000

This is read as Nine Crore Twenty Nine Lakh.

International System

i.e., 92,900,000

This is read as Ninety Two Million Nine Hundred Thousand.

Try these

Identify the incorrect places of comma and rewrite correctly.

Indian System:        56,12,34,0,1,5

9,90,03,2245

56,12,34,0,1,5 = 56,12,34,015

9,90,03,2245 = 99,00.32,245

International System: 7,5613,4534

30,30,304,040

7,5613,4534 = 756,134,534

30,30,304,040 = 3,030,304,040

Activity

Take a white chart and cut into 9 equal pieces. Write different numbers on each piece. Arrange the pieces, as many times, horizontally which form different numbers. Write any five different numbers and express them in the Indian and the International System.

ICT Corner

NUMBERS

Expected Result is shown in this picture

Step – 1

Open the Browser and copy and paste the Link given below (or) by typing the URL given (or) Scan the QR Code.

Step − 2

GeoGebra worksheet named “Place Value” will open. A Natural number is given. You can change the problem by clicking on “Problem” button.

Step-3

In the bottom page Answer the question asked by typing the number related to the question.

Step-4

Now Click on the “Place Value” to see all the place values. Repeat the test by clicking on “Problem”.