Half AdderThe Half adder is made up of an XOR gate and an AND gate.
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Full Adder This is a Full adder and it is made up of two half adders. So it will have two XOR gates, two AND gates and an OR gate. The full adder not only has two switches but it also has a carry in from another half or full adder's carry out.
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Two Bit Adder Half adder + Full adder This Two bit adder is made up of a Half adder and a Full adder. From this I learned how to combine the Half adder and Full adder to make a Two bit adder.
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Two Bit Adder Full Adder + Full Adder This Two bit adder is made up of two full adders. What I learned from this was how to combine the two full adders to make a Two bit adder.
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