A number ending in 9 will

Question:

A number ending in 9 will have the unit’s place of its square as

(a) 3                          

(b) 9

(c) 1                            

(d) 6

Solution:

(c) We know that, if a number is ending in 1 or 9 in the unit's place, then its square ends in 1 .

The number ending in 9 , will have the unit's place of its square as 1 .   $[\because 9 \times 9=81]$

 

 

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