639875 ÷ 5 
We want to figure out the number of times 639875 can be divided by 5.

Step 1:
5 can be fit into 6 1 times, resulting in a remainder of 1.
The next digit of our result is 1. 
Result so far: 1.0
Subtract 5 from 6 to get 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 5

On to step 2:
5 can be fit into 13 2 times, resulting in a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
The remainder is 3 after subtracting 10 from 13.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 5

Advancing to step 3:
5 goes into 39 7 times with a remainder of 4.
Write down 7 as next digit of the result. 
Result so far: 127.0
If we subtract 35 from 39, we get 4.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 5

Let's proceed to step 4:
5 goes into 48 9 times with a remainder of 3.
The next digit of our result is 9. 
Result so far: 1279.0
Deduct 45 from 48 and we're left with 3.
Take the next digit (7) from the dividend and append it to 3, then repeat: 37 / 5

On to step 5:
37 divided by 5 is 7 with a remainder of 2.
Put 7 as the next digit of the answer. 
Result so far: 12797.0
Deduct 35 from 37 and we're left with 2.
Grab the next digit (5) from the dividend, add it to 2, then carry on: 25 / 5

Step 6:
The number 5 fits into 25 5 times, leaving a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 127975.0
If we subtract 25 from 25, 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.

On to step 7:
5 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 127975.0
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 8:
If we divide 0 by 5, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 127975.0
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.

After the division, we end up with 127975.0 and a remainder of 0.0.