If [A] = 10 and [B] = 01, then [A] + [B] = [ ].

Larger number capacities may be obtained from 2-bit adders by paralleling them.

The inputs of a full adder are labeled A₁, B₁, and C_in.

Overflow indicators in ALU circuits indicate when add or subtract operations produce results that are too large to fit into four bits.

A binary sum is made up of only 1s and 0s.