2's Complement Subtraction calculator

SolutionHelp

1. 110 - 101 using 2's complement

2. 10110 - 11101 using 2's complement

Example

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