1. Knowing Our Numbers Worksheet With Answers Page 4
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25Use of Commas in Writing Large Numbers
In Indian system of numeration, commas are used to mark thousands, lakhs and crores. The first
·
comma is used after hundreds place, i.e., three places from the right, which marks thousands. The
second comma is used two digits later, i.e., five digits from the right, which marks lakhs and the
third comma is used further two digits later, i.e., seven digits from the right, which marks crores.
In International system of numeration, commas are used to mark thousands, millions and billions.
·
The first comma marks thousands, second marks millions and third marks billions, etc. It means
the first comma is used three places from the right, the second comma is used three digits later,
i.e., six digits from the right and finally the third comma is used further three digits later, i.e., nine
digits from the right.
While writing the number names, we do not use commas.
·
Example 2: Fill in the blanks:
(a) 1 lakh =
__________
thousand
(b) 1 lakh =
________
ten thousand
(c) 1 million =
__________
lakh
(d) 1 million =
________
hundred thousand
(e) 1 crore =
__________
lakh
(f) 1 crore =
________
million
Solution:
(a) 100
(b) 10
(c) 10
(d) 10
(e) 100
(f) 10
Example 3: Write the numerals for the following with commas at correct places.
(a) Seventy-two lakh thirty-five thousand four hundred eight
(b) Eight crore ninety-four lakh five hundred two
(c) Seventeen million three thousand four
(d) Twenty-nine billion one hundred seventy-one million four hundred two thousand
three hundred seventy-two
Solution:
(a) 72,35,408
(b) 8,94,00,502
(c) 17,003,004
(d) 29,171,402,372
Example 4: Insert commas suitably and write the number names according to Indian system of
numeration:
(a) 87595762
(b) 7013121
(c) 63432701
Solution:
Number with
Number
Number name
commas
(a) 87595762
8,75,95,762
Eight crore seventy-five lakh ninety-five thousand seven
hundred sixty-two
(b) 7013121
70,13,121
Seventy lakh thirteen thousand one hundred twenty-one
(c) 63432701
6,34,32,701
Six crore thirty-four lakh thirty-two thousand seven hundred
one
Example 5: Insert commas suitably and write the number names according to International system
of numeration:
(a) 78921301
(b) 7452283
(c) 148049831
4
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