Step by step solution :

	1	1	1
-	1	0	1

Step-1 : 1 - 1
Here 1 `=` 1, so directly subtract it
`=1-1`
`=0_2`

	1	1	1
-	1	0	1
			0

Step-2 : 1 - 0
Here 1 `>` 0, so directly subtract it
`=1-0`
`=1_2`

	1	1	1
-	1	0	1
		1	0

Step-3 : 1 - 1
Here 1 `=` 1, so directly subtract it
`=1-1`
`=0_2`

	1	1	1
-	1	0	1
	0	1	0

Step by step solution :

	1	1	0	0
-	1	0	0	1

Step-1 : 0 - 1
Here 0 `<` 1, we take borrow from 0, which takes borrow from 1
So 1 becomes 0, 0 becomes 1 and 0 becomes 0+2=2
`=2-1`
`=1_2`

			1
		0	2	2
	1	1	0	0
-	1	0	0	1
				1

Step-2 : 1 - 0
Here 1 `>` 0, so directly subtract it
`=1-0`
`=1_2`

			1
		0	2	2
	1	1	0	0
-	1	0	0	1
			1	1

Step-3 : 0 - 0
Here 0 `=` 0, so directly subtract it
`=0-0`
`=0_2`

			1
		0	2	2
	1	1	0	0
-	1	0	0	1
		0	1	1

Step-4 : 1 - 1
Here 1 `=` 1, so directly subtract it
`=1-1`
`=0_2`

			1
		0	2	2
	1	1	0	0
-	1	0	0	1
	0	0	1	1

Step by step solution :

	1	1	0	1	1
-	0	1	1	0	1

Step-1 : 1 - 1
Here 1 `=` 1, so directly subtract it
`=1-1`
`=0_2`

	1	1	0	1	1
-	0	1	1	0	1
					0

Step-2 : 1 - 0
Here 1 `>` 0, so directly subtract it
`=1-0`
`=1_2`

	1	1	0	1	1
-	0	1	1	0	1
				1	0

Step-3 : 0 - 1
Here 0 `<` 1, we take borrow from 1
So 1 becomes 0 and 0 becomes 0+2=2
`=2-1`
`=1_2`

		0	2
	1	1	0	1	1
-	0	1	1	0	1
			1	1	0

Step-4 : 0 - 1
Here 0 `<` 1, we take borrow from 1
So 1 becomes 0 and 0 becomes 0+2=2
`=2-1`
`=1_2`

		2
	0	0	2
	1	1	0	1	1
-	0	1	1	0	1
		1	1	1	0

Step-5 : 0 - 0
Here 0 `=` 0, so directly subtract it
`=0-0`
`=0_2`

		2
	0	0	2
	1	1	0	1	1
-	0	1	1	0	1
	0	1	1	1	0