Raffis Calculator 2
Here a highly advanced calculator entirely powered by redstone (and blocks, but no pistons).
Use it to calculate any of your math problems. It supports addition, subtraction, multiplication, division and so much more. If you experience any problems then write a comment and it be fixed. Make sure to read the user manual in-game to learn more about the functionalities.
version: 1.2.10, 1.2.9, 1.2.8, 1.2.7, 1.2.5, 1.2.3, 1.2.1, 1.1.0, 1.1.4, 1.1.5