Question

What could be the possible ‘one’s’ digits of the square root of each of the following numbers?

$\left(\mathrm{iv}\right)657666025$

Answer 1

Solution.

Given number is $657666025$.

Unit place digit of the number is $5$

As $5^2=25$ whose unit place is $5$

Therefore, one’s digit of the square root of $657666025$ is $5$.