643413 divided by 8 
We want to divide 643413 by 8.

Let's proceed to step 1:
8 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 8

Going ahead to step 2:
8 goes into 64 8 times with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 64 from 64 to get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 8

Step 3:
If we divide 3 by 8, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
If we subtract 0 from 3, we get 3.
Bring next digit (4) of the dividend behind the 3 and repeat the process: 34 / 8

Step 4:
If we divide 34 by 8, we get 4 and a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 804.0
If we subtract 32 from 34, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 8

Advancing to step 5:
21 divided by 8 is 2 with a remainder of 5.
Record the quotient 2 as the next digit in the result. 
Result so far: 8042.0
Subtracting 16 from 21 leaves us with 5.
Grab the next digit (3) from the dividend, add it to 5, then carry on: 53 / 8

Step 6:
8 goes into 53 6 times with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 80426.0
Subtracting 48 from 53 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
If we divide 50 by 8, we get 6 and a remainder of 2.
Record the quotient 6 as the next digit in the result. 
Result so far: 80426.6
The remainder is 2 after subtracting 48 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
The number 8 fits into 20 2 times, leaving a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 80426.62
Subtract 16 from 20 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
The number 8 fits into 40 5 times, leaving a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 80426.625
If we take 40 away from 40, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 80426.625
The remainder is 0 after subtracting 0 from 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:
The number 8 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 80426.625
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

In conclusion, the division gives 80426.625 with a balance of 0.0.