Perfect square numbers ending with '1' will have their square roots ending in _____________.

Correct option is C

: Any number having the last digit as 1 will always have 1 as a unit digit in its square
1$$^2$$=1, 11$$^2$$​ = 121, 21$$^2$$​ = 441 and so on
:: Any number having the last digit as 9 will always have 1 as a unit digit in its square
9$$^2$$=81, 19​$$^2$$​ = 361, 29$$^2$$​ = 841 and so on
=> 9$$^2$$​=81
Perfect square numbers ending with '1' will have their square roots ending in 1 or 9.