Find the square roots of the following perfect squares using the long division method:

$35,70,96,609$

Find the least number that must be subtracted from the following numbers to make them a perfect square:

$2,07,978$

Find the least number that must be subtracted from the following numbers to make them a perfect square:

$4,23,886$

Find the least number that must be subtracted from the following numbers to make them a perfect square:

$4,85,933$

Find the least number that must be subtracted from the following numbers to make them a perfect square:

$2,78,840$

Find the least number that must be added to the following numbers to make them a perfect square:

$5,687$

Find the least number that must be added to the following numbers to make them a perfect square:

$8,743$

Find the least number that must be added to the following numbers to make them a perfect square:

$15,120$

Find the least number that must be added to the following numbers to make them a perfect square:

$6,156$