We look at the division of 638649 by 2 
Our goal is to divide 638649 by 2.

Going ahead to step 1:
6 divided by 2 is 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 3.0
If we take 6 away from 6, we end up with 0.
Fetch the next digit (3) from the dividend, attach it to 0 and continue: 3 / 2

Step 2:
When dividing 3 by 2, we get 1 with a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 31.0
If we take 2 away from 3, we end up with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 2

Let's proceed to step 3:
If we divide 18 by 2, we get 9 and a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 319.0
Deduct 18 from 18 and we're left with 0.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 2

Moving on to step 4:
2 can be fit into 6 3 times, resulting in a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3193.0
Subtracting 6 from 6 leaves us with 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 2

Moving on to step 5:
When dividing 4 by 2, we get 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 31932.0
If we take 4 away from 4, we end up with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 2

On to step 6:
2 can be fit into 9 4 times, resulting in a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 319324.0
The remainder is 1 after subtracting 8 from 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
When dividing 10 by 2, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 319324.5
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.

Moving on to step 8:
2 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 319324.5
If we subtract 0 from 0, 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.

Let's proceed to step 9:
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: 319324.5
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.

The final result is 319324.5 with a remainder of 0.0.