639993 ÷ 5 
We're looking to find how many times 5 goes into 639993.

Moving on to step 1:
6 divided by 5 is 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 5 from 6 and we're left with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 5

Let's proceed to step 2:
5 goes into 13 2 times with a remainder of 3.
The next digit of our result is 2. 
Result so far: 12.0
If we subtract 10 from 13, we get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 5

On to step 3:
The number 5 fits into 39 7 times, leaving a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 127.0
Subtract 35 from 39 to get 4.
Grab the next digit (9) from the dividend, add it to 4, then carry on: 49 / 5

Let's proceed to step 4:
The number 5 fits into 49 9 times, leaving a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 1279.0
Deduct 45 from 49 and we're left with 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 5

Going ahead to step 5:
The number 5 fits into 49 9 times, leaving a remainder of 4.
Use 9 as the next digit of our solution. 
Result so far: 12799.0
If we subtract 45 from 49, we get 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 5

Going ahead to step 6:
5 can be fit into 43 8 times, resulting in a remainder of 3.
Put 8 as the next digit of the answer. 
Result so far: 127998.0
Subtract 40 from 43 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 7:
If we divide 30 by 5, we get 6 and a remainder of 0.
Use 6 as the next digit of our solution. 
Result so far: 127998.6
Subtracting 30 from 30 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:
5 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: 127998.6
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.

Going ahead to step 9:
When dividing 0 by 5, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 127998.6
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 result is 127998.6 with a remainder of 0.0.