Let's divide 639459 by 5
We want to divide 639459 by 5.

Advancing to step 1:
6 divided by 5 is 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 5 from 6 and we're left with 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 5

Step 2:
When dividing 13 by 5, we get 2 with a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtracting 10 from 13 leaves us with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 5

Moving on to step 3:
5 goes into 39 7 times with a remainder of 4.
Use 7 as the next digit of our solution. 
Result so far: 127.0
If we subtract 35 from 39, we get 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 5

Step 4:
If we divide 44 by 5, we get 8 and a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 1278.0
Deduct 40 from 44 and we're left with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 5

Advancing to step 5:
When dividing 45 by 5, we get 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 12789.0
Subtracting 45 from 45 leaves us with 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 5

On to step 6:
5 goes into 9 1 times with a remainder of 4.
The next digit of our result is 1. 
Result so far: 127891.0
Subtracting 5 from 9 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
5 can be fit into 40 8 times, resulting in a remainder of 0.
Use 8 as the next digit of our solution. 
Result so far: 127891.8
Deduct 40 from 40 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.

Moving on to step 8:
5 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 127891.8
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.

Moving on to step 9:
0 divided by 5 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 127891.8
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.

The final outcome is 127891.8, with a leftover of 0.0.