Hello this is my redstone calculator that I have been working on for some time. It is capable of performing addition, subtraction, multiplication, and division. It can handle numbers up to 999. I have provided a world download so you can play around with yourselves. Keep in mind that this is newly finished and may still contain minor bugs. If you find any bug please tell me so I can fix them. Feedback is appreciated.
Minecraft forums post: http://www.minecraftforum.net/topic/1931482-redstone-calculator/#entry23808047

Also check out my channel at: http://www.youtube.com/user/Newomaster