1. Find Subtraction of 110 and 101 using 2's complement method

Here A = 110, B = 101.
Find A - B = ? using 2's complement
First find 2's complement of B = 101

Note : 2's complement of a number is 1 added to it's 1's complement number.
1's complement of 101 is

	1	1	1
-	1	0	1
	0	1	0

Now add 1 : 010 + 1 = 011

Now Add this 2's complement of B to A

1	1
	1	1	0
+	0	1	1
1	0	0	1

Hints : (Move mouse over the steps for detail calculation highlight)

Step-1 `=0+1` `=0+1` `=1` `=2xx0+1` `=1_2` `:.` Sum`=1`	Step-2 `=1+1` `=1+1` `=2` `=2xx1+0` `=10_2` `:.` Sum`=0` and carry`=1`
Step-3 `=1+1+0` `=1+1+0` `=2` `=2xx1+0` `=10_2` `:.` Sum`=0` and carry`=1`

The left most bit of the result is called carry and it is ignored.
So answer is 001