Question

Question 4

Write the correct answer from the given four options.

Which of the following will have 4 at the unit's place?

a) ${14}^2$
b) ${62}^2$
c) ${27}^2$
d) ${35}^2$

Answer 1

The unit place of the square of 14 $=4^2=16=6$
The unit place of the square of 62 $=2^2=4$ $[\because 2^2=4]$
The unit place of the square of 27 $=7^2=49=9$
The unit place of the square of 35 $=5^2=25=5$
Clearly, ${62}^2$ has 4 at the unit's place.