Digital adders are used everywhere where calculations must be performed. Think of processing units of a microprocessor. Adders form the core of these units, called Arithmetic Logic Units (ALU).
If you want to know what adders are, how they work and where they are used, this is the right place. With C-MOS logic IC's you build simple adders, and expand them. For adders means not only those that add two binary numbers, but also those that subtract, multiply and divide.
Another issue is speed. Adder must be able to process a large amounts of number. Hence, the speed at which the adder calculates the numbers, is very important. Here, you get to know the most important circuits.
To get started you need to do a few preparations...