Number System
posted by Jnr John .
Subtract the following numbers using the standard method.
111 1110 0010  100 0111  111 =

Subtraction is done as in decimal, one digit at a time from the right. Borrow from the left digit if necessary.
If the result is expected to be negative, reverse the subtraction (to get a positive difference) and then change the sign.
Example:
1101
0110

0111