Convert the following:
1 billion = _________ crores
A. 1
B. 10
C. 100
D. 1000

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Hint: In order to find the correct option, differentiate between the correct option on the basis of digits represented on the option as well as the system of representation. Divide Billion by 1 crore to get a number of crores.

Complete step-by-step answer:

As we know the both Indian and International number system, we will write the given number in both of the number systems and then differentiate.
International number system contains ones, thousands, million and billion groups.
So, 1 billion in the International number system is represented as 1,000,000,000.
As we know that Indian number system contains ones, thousands, lakhs, crores etc
So, 1 crore in Indian number system is represented as 1,00,00,000.
In order to find the number of crores in 1 billion let us divide 1 billion by 1 crore.
So Number of billions in 1 crore:
   = \dfrac{{1,000,000,000}}{{1,00,00,000}} \\
   = 100 \\
Hence, there are 100 crores in 1 billion.

So, option C is the correct option.

Note: In such a type of problem where 1 unit is asked to convert into another divide the one to be converted to the system into which it should be converted. The main difference between the Indian number system and International number system is the position of the separators or commas .In Indian numbering system, lakhs are written after thousands while in international numbering systems, millions are written after thousands. Indian system is followed in India, Pakistan and Bangladesh. It is still called as Indian number system owing to its Union (Indian sub-continent) during the British rule.