We divide 643693 by 2
Our goal is to divide 643693 by 2.

Going ahead to step 1:
When dividing 6 by 2, we get 3 with a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 3.0
The remainder is 0 after subtracting 6 from 6.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 2

Moving on to step 2:
The number 2 fits into 4 2 times, leaving a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 32.0
Deduct 4 from 4 and we're left with 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 2

Let's proceed to step 3:
2 goes into 3 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 321.0
The remainder is 1 after subtracting 2 from 3.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 2

Going ahead to step 4:
2 can be fit into 16 8 times, resulting in a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 3218.0
Subtracting 16 from 16 leaves us with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 2

On to step 5:
9 divided by 2 is 4 with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 32184.0
If we subtract 8 from 9, we get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 2

Advancing to step 6:
When dividing 13 by 2, we get 6 with a remainder of 1.
Record the quotient 6 as the next digit in the result. 
Result so far: 321846.0
The remainder is 1 after subtracting 12 from 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 7:
If we divide 10 by 2, we get 5 and a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 321846.5
If we subtract 10 from 10, we 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 8:
2 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 321846.5
If we take 0 away from 0, 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.

Let's proceed to step 9:
2 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 321846.5
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.

In conclusion, the division gives 321846.5 with a balance of 0.0.