Example of binary subtraction of Negative number
Case 2. Negative number is more than the positive number ( i e, answer is negative)
Example : Subtract 92_{10} ( 1011100_{2} ) from 45_{10} ( 101101_{2}).
Solution : write both numbers in 8 bit form
00101101 (45_{10})
01011100 (92_{10})
1 s complement of the negative number 10100011
Add 1 1
2 complement of the negative number 10100100
Adding 2 s complement of the negative number with the first (positive ) number,
+10100100( -92_{10})
11010001(-47_{10})
No carry means the answer is negative and is in 2 complement form i e, 1101 0001 is 2 complement of 00101111_{2}, u e 7410 means the answer is -47_{10}.