A good answer might be:
1000 1100 (correct)
The number to be subtracted is negated by the
usual means, as in the previous problem.
Then the "binary addition algorithm" is used:
11100 111
1110 0101 == -27d
1010 0111 == -89d
--------- -----
1000 1100 -116d
Since the carry into the most significant column is the same
as the carry out of that column the result is correct.
The answer came out negative, but that is fine.
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