How do I find the square root of 169?

Question

parthkohli · Answer

You can see and tell that it is $\pm 13$

jamierox4ev3r · Answer

just divide 169 by 13 because 13*13 equals 169.

jack1 · Answer

for another way, look up "Newton-Raphson" method... long winded but will work out all square roots for you, eg sqrt 3, sqrt 168

anonymous · Answer

How would I find out that it's 13x13?

jamierox4ev3r · Answer

square roots are just something i memorize

anonymous · Answer

Is that the only way? to memorize?

jamierox4ev3r · Answer

or there is also jack's way, but it is very long winded

anonymous · Answer

:c

jack1 · Answer

guesstimating
you know 10^2 = 100, so must be bigger
you know 15^5 = 225, so must be smaller, leaves a range of 4 possibilities

hunus · Answer

Also, you know that it must end with either a three or a seven. And since you know it has to be greater than 10 and less than 15 your only choice is 13

jack1 · Answer

or you could get a pile of 169 rocks, and see how many even piles of the same number of rocks as piles you can split them in to...?

jamierox4ev3r · Answer

jack that would take a lot of time lol :)

aonz · Answer

type in calculator derp?

anonymous · Answer

13