Saturday, January 12, 2008

Square Root Without a Calculator!

I found this on the internet in 1998 and saved it to my computer because I thought it was pretty amazing. It's is a method to take the square root of any number without using a calculator. All you need is a pencil and paper and a new long division algorithm.

I find this so facsinating because we take so much for granted with out sophisticated graphing calculators, it's nice to know how to get along with out one, if only for a simple mathematical operation. Enjoy!

(Click on the image)

1 comment:

ddting said...

The algorithm is more complicated than just guessing at it a bunch of times!!!

I.E.
2 x 2 =4
3 x 3 = 9
2.5 x 2.5 = 6.25
2.7 x 2.7 = 7.29
2.6 x 2.6 = 6.76
2.65 x 2.65 = 7.0225
2.64 x 2.64 = 6.9696
2.645 x 2.645 = 6.996