NCERT Class 6 Solutions: Knowing Your Numbers (Chapter 1) Exercise 1.1 – Part 4
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Q4 Insert commas suitable and write the names according to international system of numeration:

78921092

7452283

99985102

48049831
Solution:
The following table shows how the numerals are named in International systems.
Hindi  Indian figure  Powernotation  International figure  International Names 
one  1  10^{0}  1  One 
ten  10  10^{1}  10  Ten 
one hundred  100  10^{2}  100  One hundred 
one thousand  1,000  10^{3}  1,000  One thousand 
ten thousand  10,000  10^{4}  10,000  Ten thousand 
one lakh (also lac)  1,00,000  10^{5}  100,000  One hundred thousand 
ten lakh  10,00,000  10^{6}  1,000,000  One million 
one crore  1,00,00,000  10^{7}  10,000,000  Ten million 
ten crore  10,00,00,000  10^{8}  100,000,000  One hundred million 
one arab or one hundred crore  1,00,00,00,000  10^{9}  1,000,000,000  One billion 
ten arab  10,00,00,00,000  10^{10}  10,000,000,000  Ten billion 
one kharab  1,00,00,00,00,000  10^{11}  100,000,000,000  One hundred billion 
ten kharab  10,00,00,00,00,000  10^{12}  1,000,000,000,000  One trillion 
one neel  1,00,00,00,00,00,000  10^{13}  10,000,000,000,000  Ten trillion 
ten neel  10,00,00,00,00,00,000  10^{14}  100,000,000,000,000  One hundred trillion 
one padm  1,00,00,00,00,00,00,000  10^{15}  1,000,000,000,000,000  One quadrillion 
ten padm  10,00,00,00,00,00,00,000  10^{16}  10,000,000,000,000,000  Ten quadrillion 
one shankh  1,00,00,00,00,00,00,00,000  10^{17}  100,000,000,000,000,000  One hundred quadrillion 
ten shankh  10,00,00,00,00,00,00,00,000  10^{18}  1,000,000,000,000,000,000  One quintillion 
Here is an example: 42,342,783 will be called
Or Fourty two million, three hundred and fourty two thousand, seven hundred and eighty three.

78921092

7452283

99985102
International System of numeration

48049831