Fill in the blanks:
A) 1 Lakh = ___________ ten thousand
B) 1 million = ___________ hundred thousand
C) 1 Crore = ___________ ten lakh
D) 1Crore = ___________ million
E) 1 million = ___________ Lakh

Hint:It should be noted here that in the problem, we have to find out the relation between International Number system and Indian Number System. In the Indian Number system, we use ones, tens, hundreds, thousands, ten thousands, lakhs, ten lakhs, etc. Whereas, in the International Number system, we use ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions, ten millions, hundred millions, billions, etc.

Formula used:
Complete step-by-step answer:
Before, attempting the problem, we should know the Indian and International Number Systems.
Indian Number System:
In this system, the place of a digit is expressed as ones, tens, hundreds, thousands, ten thousands, lakhs, ten lakhs, etc. Here, it is noted that in this system, we use comma (,) to pair the digits from the right. First three digits (in large numbers) are paired in one and then after two digits are paired and separated by comma (,). The below example will clarify the concept of pairing and number distribution.
Example: A number is 123456789. Now this shall be paired in the Indian Number System by the following way:
$12,34,56,789$
And the place values can be written as
9 - Ones
8 - Tens
7 - Hundreds
6 - Thousands
5 - Ten Thousands
4 - Lakhs
3 - Ten Lakhs
2 - Crores
1 - Ten Crores
International Number System:
In this system, the place of a digit is expressed as ones, tens, hundreds, thousands, ten thousands, hundred thousands, millions, ten millions, hundred millions, billions, etc. Here, it is noted that in this system, we use comma (,) to pair the digits from the right. The digits are paired in a group of three. The below example will clarify the concept of pairing and number distribution.
Example: A number is 123456789. Now this shall be paired in the International Number System by the following way:
$123,456,789$
And the place values can be written as
9 - Ones
8 - Tens
7 - Hundreds
6 - Thousands
5 - Ten Thousands
4 - Hundred Thousands
3 - Millions
2 - Ten millions
1 - Hundred millions
Now, coming to the problem, with the help of information given above, it can be re-written as below:
1 Lakh = 10 ten thousand
1 million = 10 hundred thousand
1 Crore = 10 ten lakh
1Crore = 10 million
1 million = 10 Lakh

Note:Before solving the problem, you should know what number system is and how it can be related to the other number system. If this knowledge is handy, these types of problems can be solved easily.