Half Adder One important circuit is the Half-Adder. Computer Scientists realised that if they combined an ____ OR (XOR) and an ____ gate in a circuit, it could add ____ bits together. The issue with the Half-Adder is that it is only good for adding 2 single bits together. What if we wanted to add 2 two-bit numbers together, or even 2 ____ together? Full Adder It wasn’t long before Computer Scientists realised that they could ____ 2 half-adders (and an ____ gate) to enable the addition of 2 binary numbers of any length. A full adder can add three bits together to produce a ____ and a carry. This means that it can receive the ____ from a previous addition, adding that carry to the addition of two new bits.

Adder Circuits

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