Divisibility Rule of 11


 
 
Concept Explanation
 

Divisibility Rule of 11

Divisibility Rule of 11 :

Justification:

Consider a two digit number overline{ab}.

   We have,     overline{ab} = 10a + b

Rightarrow       overline{ab} = 11a + b - a

Rightarrow      overline{ab} = a multiple of 11 + ( b - a )

Rightarrow     overline{ab} is a multiple of 11, if b - a is a multiple of 11

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Sample Questions
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Question : 1

Find the value of a + b + c, if 373a is divisible by 9, 473b is divisible by 11 and 373c is divisible by 6.

Right Option : A
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Question : 2

What least value should be given to * so that the number 234*65 is divisible by 11?

Right Option : D
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Explanation
Question : 3

Which of the following number is divisible by 22?

Right Option : C
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Explanation
 
 
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