Method : 1's complement subtraction steps :
1. At first, find 1's complement of the B(subtrahend).
2. Then add it to the A(minuend).
3. If the final carry over of the sum is 1, then it is dropped and 1 is added to the result.
4. If there is no carry over, then 1's complement of the sum is the final result and it is negative.

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

Solution:

1's complement subtraction steps :

1. At first, find 1's complement of the B(subtrahend).
2. Then add it to the A(minuend).
3. If the final carry over of the sum is 1, then it is dropped and 1 is added to the result.
4. If there is no carry over, then 1's complement of the sum is the final result and it is negative.

Here A = 110, B = 101.
Find A - B = ? using 1's complement
First find 1's complement of B = 101


Step-1: 1's complement of 101 is obtained by subtracting each digit from 111

	1	1	1
-	1	0	1
	0	1	0

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Step-2: Now Add this 010 to 110

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

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Step by step solution of 110 + 010 = 1000

Write the numbers, so that each digit lines up vertically

	1	1	0
+	0	1	0

Step-1 :
`=0_2+0_2`
`=0_10+0_10`
`=0_10`
`=0_2`
Write the 0 in the sum place

	1	1	0
+	0	1	0
			0

Step-2 :
`=1_2+1_2`
`=1_10+1_10`
`=2_10`
`=2xx1+0`
`=10_2`
Write the 0 in the sum place and carry the 1 to the next carry place

	1
	1	1	0
+	0	1	0
		0	0

Step-3 :
`=1+1_2+0_2`
`=1+1_10+0_10`
`=2_10`
`=2xx1+0`
`=10_2`
Write the 10 in the sum place

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

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The left most bit (1) of the result (1000) is called carry and add it to the rest part of the result (000)

	0	0	0
+			1
	0	0	1

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So answer is 001

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