Interchanging Digits


 
 
Concept Explanation
 

Problems Involving Interchanging Digits

Interchanging Digits:

The general form of a two digit number overline{ab} is

overline{ab}=10times a+b    

On reversing the digits the number becomes overline{ba}    

overline{ba}=10times b+a

As the digit at tens place is b so we multiply b with 10 and then add a.

Now let solve the problems involving interchanging of digits.  

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Sample Questions
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Question : 1

The difference between a 2- digit number and the number obtained by reversing the digit is 27.The difference between the two digit of that number is _____________

Right Option : C
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Explanation
Question : 2

The difference between a 2- digit number and the number obtained by reversing the digit is 63.The difference between the two digit of that number is _____________

Right Option : D
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Explanation
Question : 3

The difference between a 2- digit number and the number obtained by reversing the digit is 45 .The difference between the two digit of that number is _______________.

Right Option : A
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Explanation
 
 


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