Instructables

Step 4: How It Works - Part III

Now that we have full adders, its time to put them together to make a calculator.  To connect all of the adders together, you have to connect the carry-outs to the carry-ins in a cascading fashion.  So the carry-out of the first adder connects to the carry-in of the second adder and so on.

Below shows the concept.  The blocks represent the adders and the arrows are the carry-ins and carry-outs.

 
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