Question is how many perfect squares are less than 10,000.
I believe perfect squares are 1,4,9,16,25,36,49,64,81 and 100.
Someone mentioned the answer was 99, but I am not sure how they got there.
Thank you.
The answer is quite simple just take a look at $\displaystyle \sqrt{10000}=100$. So there has to be 99 numbers whose squares are less than 10000. You can also take a look at here to get to know perfect squares better. Note: if you consider 0 as a perfect square (and usually you do) then there are 100 perfect squares less than 10000.