Question

Find the least number that should be subtracted from $1,300$ to get perfect square.

Answer 1

$\sqrt{1300}=36.05$

Observe that the square root of $1300$ is slightly more than $36$.

and

$(36{)}^2$ = $1296$

$\therefore$ The smallest number to be subtracted from $1300$ to make it a perfect square = 1300 - 1296 = $4$.