Question 187664
Start by writing down a few squares of numbers:
{{{20^2 = 400}}}
{{{21^2 = 441}}}
{{{22^2 = 484}}}
You can see by inspection that the given number of 471 lies between 441 and 484, so this indicates that the {{{sqrt(471)}}} lies between {{{sqrt(441) = 21}}} and {{{sqrt(484) = 22}}}.
The answer is 21 and 22