We divide 638339 by 2
We're looking to find how many times 2 goes into 638339.

Step 1:
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: 3.0
If we subtract 6 from 6, we get 0.
Take the next digit (3) from the dividend and append it to 0, then repeat: 3 / 2

Let's proceed to step 2:
3 divided by 2 is 1 with a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 31.0
If we subtract 2 from 3, we get 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 2

On to step 3:
2 can be fit into 18 9 times, resulting in a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 319.0
Subtracting 18 from 18 leaves us with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 2

Moving on to step 4:
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: 3191.0
Deduct 2 from 3 and we're left with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 2

On to step 5:
2 goes into 13 6 times with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 31916.0
The remainder is 1 after subtracting 12 from 13.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 2

Let's proceed to step 6:
When dividing 19 by 2, we get 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 319169.0
If we subtract 18 from 19, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
If we divide 10 by 2, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 319169.5
Deduct 10 from 10 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.

Step 8:
If we divide 0 by 2, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 319169.5
Subtracting 0 from 0 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 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: 319169.5
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 319169.5 with a remainder of 0.0.