Instructables
Here's a horrible video of it working. I'll upload a better one later.

 
Of course this is for the make to learn youth contest, so here are the answers to all your questions!

What did I make?
Well I thought it was time my Arduino learned to do some math, so I began these project with it printing out all the results to the serial monitor. After seeing my LCD screen sitting forlornly in the corner of my electronics box, I then decided it was time to make a project!
How did I make it?
Well I made use a small breadboard, some potentiometers, jumper wires, my lcd screen, and my Arduino. Programming this was the hardest part, and it was very educational for me. My ideas changed? Yes, actually, quite drastically. I was never intending to use my LCD screen until I happend to notice it, and decided it was time to learn how to use it. I'm 15 years old made this project by myself. A fellow instructables member laxap helped me with code in step 6
Where did I make it?
Haha, where? Like, everywhere in my house, but mostly on my kitchen table. Since our iMac was in the shop (no, it wasn't broken, we were just upgrading it) I was using my Dad's laptop to type all the code. I did this as a school project for my electronics, and hopefully, I'll earn a good grade :D
What did I learn?
I learned a whole lot, like using my LCD screen, using numbers with Arduino, making it do math and all that kind of stuff. If I could do it again differently, I not exactly sure at the moment what I would change. Oh, and I'm proudest of my incredible (assisted :D) math :D
 
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Step 1: Ingredients:

Electronics
  • Arduino
  • Breadboard
  • LCD*
  • 2x 50k pots
  • 150 ohm resistor
  • Jumper wires, and tons of them!
If you do not want to use a LCD then you will have to use serial monitor. Wherever you see lcd.print just change it to Serial.print. Instead of lcd.begin change it to Serial.begin(9600);.