## JamesR4494 2 years ago How do I find the square root of 169?

1. ParthKohli

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

2. Jamierox4ev3r

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

3. Jack1

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

4. JamesR4494

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

5. Jamierox4ev3r

square roots are just something i memorize

6. JamesR4494

Is that the only way? to memorize?

7. Jamierox4ev3r

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

8. JamesR4494

:c

9. Jack1

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

10. Hunus

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

11. Jack1

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...?

12. Jamierox4ev3r

jack that would take a lot of time lol :)

13. AonZ

type in calculator derp?

14. 00015935

13