Step by step solution :

	6	3	0
-	2	0	5

Step-1 : 0 - 5
Here 0 `<` 5, we take borrow from 3
So 3 becomes 2 and 0 becomes 0+8=8
`=8-5`
`=3_8`

		2	8
	6	3	0
-	2	0	5
			3

Step-2 : 2 - 0
Here 2 `>` 0, so directly subtract it
`=2-0`
`=2_8`

		2	8
	6	3	0
-	2	0	5
		2	3

Step-3 : 6 - 2
Here 6 `>` 2, so directly subtract it
`=6-2`
`=4_8`

		2	8
	6	3	0
-	2	0	5
	4	2	3

Step by step solution :

	3	2	1
-	0	4	7

Step-1 : 1 - 7
Here 1 `<` 7, we take borrow from 2
So 2 becomes 1 and 1 becomes 1+8=9
`=9-7`
`=2_8`

		1	9
	3	2	1
-	0	4	7
			2

Step-2 : 1 - 4
Here 1 `<` 4, we take borrow from 3
So 3 becomes 2 and 1 becomes 1+8=9
`=9-4`
`=5_8`

		9
	2	1	9
	3	2	1
-	0	4	7
		5	2

Step-3 : 2 - 0
Here 2 `>` 0, so directly subtract it
`=2-0`
`=2_8`

		9
	2	1	9
	3	2	1
-	0	4	7
	2	5	2

Step by step solution :

	2	5	4	3	0
-	0	4	0	7	7

Step-1 : 0 - 7
Here 0 `<` 7, we take borrow from 3
So 3 becomes 2 and 0 becomes 0+8=8
`=8-7`
`=1_8`

				2	8
	2	5	4	3	0
-	0	4	0	7	7
					1

Step-2 : 2 - 7
Here 2 `<` 7, we take borrow from 4
So 4 becomes 3 and 2 becomes 2+8=10
`=10-7`
`=3_8`

				10
			3	2	8
	2	5	4	3	0
-	0	4	0	7	7
				3	1

Step-3 : 3 - 0
Here 3 `>` 0, so directly subtract it
`=3-0`
`=3_8`

				10
			3	2	8
	2	5	4	3	0
-	0	4	0	7	7
			3	3	1

Step-4 : 5 - 4
Here 5 `>` 4, so directly subtract it
`=5-4`
`=1_8`

				10
			3	2	8
	2	5	4	3	0
-	0	4	0	7	7
		1	3	3	1

Step-5 : 2 - 0
Here 2 `>` 0, so directly subtract it
`=2-0`
`=2_8`

				10
			3	2	8
	2	5	4	3	0
-	0	4	0	7	7
	2	1	3	3	1