Let's divide 643123 by 2
Our goal is to divide 643123 by 2.

Step 1:
When dividing 6 by 2, we get 3 with a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
Subtract 6 from 6 to get 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 2

Let's proceed to step 2:
2 can be fit into 4 2 times, resulting in a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 32.0
Subtract 4 from 4 to get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 2

Advancing to step 3:
When dividing 3 by 2, we get 1 with a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 321.0
Subtracting 2 from 3 leaves us with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 2

Moving on to step 4:
When dividing 11 by 2, we get 5 with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 3215.0
Deduct 10 from 11 and we're left with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 2

Going ahead to step 5:
2 can be fit into 12 6 times, resulting in a remainder of 0.
The number 6 becomes the next digit in our result. 
Result so far: 32156.0
If we subtract 12 from 12, we get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 2

Let's proceed to step 6:
2 goes into 3 1 times with a remainder of 1.
The next digit of our result is 1. 
Result so far: 321561.0
Subtracting 2 from 3 leaves us with 1.
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:
2 goes into 10 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 321561.5
Subtracting 10 from 10 leaves us 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 8:
2 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 321561.5
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.

Let's proceed to step 9:
If we divide 0 by 2, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 321561.5
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.

The quotient of the division is 321561.5, and the remainder is 0.0.