This calculator will "mechaincally" perform an arithmatic oporation on numbers 1 and 2. The digits of number1 are represented by the blue things at the top while those of number2 are represented by the top row of gray deflectors. To flip these bits just click on them. The decimal representation of numbers 1 and 2 are displayed at the bottom. You can also set fractional amounts for number2 by clicking on the last row of gray deflectors. Once you have entered your numbers (or prior to doing so) select which oporation you want done to them: addition or multiplication (the buttons in the lower left). Then press go! The result of the oporation will end up as number1.
