Would you consider this to be doing math the old-fashioned way? Instead of going with silicon-based switching (ie: transistors) this 4-bit adder uses mechanical relays. We like it for its mess of ...

In divide & conquer approach the 16 bit number is divided into individual 8 bits. If we continue to divide we reach the leaf level of the problem. In the leaf level of the D&C Tree is a 1 bit adder, ...