Find the square root of the following numbers by the repeated subtraction method.

$16$

Find the square root of the following numbers by the repeated subtraction method.

$49$.

Find the square root of the following numbers by the repeated subtraction method.

$64$.

Find the square root of the following numbers by the repeated subtraction method.

$100$.

Find the square root of the following numbers by the repeated subtraction method.

$169$.

Find the square root of the following numbers by the repeated subtraction method.

$81$.

Find the square root of the following numbers by the repeated subtraction method.

$256$.

Find the square root of the following numbers by the repeated subtraction method.

$144$.

Find the square root of each of the following by prime factorisation.

$225$.