# How do you simplify sqrt 256?

With a calculator it is easy you just type in $\sqrt{256}$
you could start with $15 \times 15$ which equals 225, so you know that is wrong and it's lower than 256.
You would than know that the number has to be increased so you could try $17 \times 17$ however that equals 289, which is too high.
You would then try $16 \times 16$ which is equal to 256.