We divide 639521 by 6
We want to figure out the number of times 639521 can be divided by 6.

Moving on to step 1:
6 divided by 6 is 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 6 from 6 to get 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 6

Let's proceed to step 2:
If we divide 3 by 6, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 10.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 6

Advancing to step 3:
When dividing 39 by 6, we get 6 with a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 106.0
Subtract 36 from 39 to get 3.
Bring next digit (5) of the dividend behind the 3 and repeat the process: 35 / 6

Moving on to step 4:
6 can be fit into 35 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 1065.0
The remainder is 5 after subtracting 30 from 35.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 6

Step 5:
52 divided by 6 is 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 10658.0
Deduct 48 from 52 and we're left with 4.
Grab the next digit (1) from the dividend, add it to 4, then carry on: 41 / 6

Step 6:
The number 6 fits into 41 6 times, leaving a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 106586.0
Deduct 36 from 41 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 7:
The number 6 fits into 50 8 times, leaving a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 106586.8
Subtracting 48 from 50 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
20 divided by 6 is 3 with a remainder of 2.
Write down 3 as next digit of the result. 
Result so far: 106586.83
The remainder is 2 after subtracting 18 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 9:
The number 6 fits into 20 3 times, leaving a remainder of 2.
Use 3 as the next digit of our solution. 
Result so far: 106586.833
Subtracting 18 from 20 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 106586.833, with a leftover of 0.0002.