Properties of Square - Unit Digit of Square


 
 
Concept Explanation
 

Properties of Square - Unit Digit of Square

Property:  If a number has a square root in N, then its unit digit must be 0, 1, 4, 5 or 9.

Units digit of square: 0 1 4 5 6 9
Units digit of square root: 0 1 or 9 2 or 8 5 4 or 6 3 or 7
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Sample Questions
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Question : 1

What will be the "one's digit" in the square of 1234?

Right Option : A
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Question : 2

What will be the unit digit in the square of  1729 ?

Right Option : A
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Explanation
Question : 3

What will be the unit digit in the squares of 126 , 1278 and 124589 respectively ?

Right Option : A
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