To find the two's complement form of -25 using 8 bits, we first need to represent 25 in binary form. 25 in binary is 00011001. To get the two's complement of -25, we invert all the bits of 00011001 to get 11100110. Finally, we add 1 to the inverted binary number to get the two's complement form of -25, which is 11100111 in 8 bits.
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25 in Binary is 00011001, the one's complement of this is 11100110 and to find the two's complement add 1 to the one's complement as follows
11100110
00000001
________
11100111
________
100000000000001
00110011 is the 2's complement for this unsigned number and 10110011 if this is a signed number
The advantage of the two's complement method is that the procedure for adding or subtracting numbers is the same, whether the numbers are positive or negative. This makes the hardware for managing these numbers simpler.
6/2 = 3
2+2+2+2-1=7