# How do I perform these functions without using a calculator?

1. Apr 3, 2009

### Altrepair

Anyone know of books or websites that teach one how to find square roots, cube roots, sin, cosine, e, ln, pi and so forth without using a calculator because this stuff is not taught in schools, but instead is simply calculated with calculators which is not what I like considering taking things for advantage is never wise.

2. Apr 3, 2009

### rwisz

That's a method of computing square roots by hand.

That's a method of computing cube roots by hand.

http://www.uconn.edu/~cdavid/latex2html/mathreview/node18.html [Broken]
Sine, cosine, e, and ln can all be approximated (albeit not with ease) using series approximations. (as well as Pi, but it's not fun)

http://en.wikipedia.org/wiki/Numerical_approximations_of_π
That's for numerical approximations of pi, have fun!

Last edited by a moderator: May 4, 2017
3. Apr 3, 2009

### cragar

you could use a slide rule.

4. Apr 3, 2009

### Phrak

Or crayons and a ruler.

5. Apr 3, 2009

### rwisz

My preferred method

6. Apr 3, 2009

### HallsofIvy

Staff Emeritus
Right, they won't let me have sharp things like pencils.