643235 ÷ 8 
Let's see how many times 8 fits into 643235.

Moving on to step 1:
8 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 8

Step 2:
8 can be fit into 64 8 times, resulting in a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Deduct 64 from 64 and we're left with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 8

Advancing to step 3:
8 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 80.0
If we subtract 0 from 3, we get 3.
Append the next digit (2) from the dividend to 3 and continue with: 32 / 8

On to step 4:
8 can be fit into 32 4 times, resulting in a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 804.0
The remainder is 0 after subtracting 32 from 32.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 8

Step 5:
When dividing 3 by 8, we get 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 8040.0
Subtract 0 from 3 to get 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 8

Going ahead to step 6:
When dividing 35 by 8, we get 4 with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 80404.0
Subtract 32 from 35 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
When dividing 30 by 8, we get 3 with a remainder of 6.
Write down 3 as next digit of the result. 
Result so far: 80404.3
Subtracting 24 from 30 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
8 goes into 60 7 times with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 80404.37
The remainder is 4 after subtracting 56 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
40 divided by 8 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 80404.375
Subtract 40 from 40 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 10:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 80404.375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 11:
When dividing 0 by 8, we get 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 80404.375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 80404.375 with a remaining 0.0.