639700 divided by 12 
The aim is to understand the frequency of 12 in 639700.

Going ahead to step 1:
6 divided by 12 is 0 with a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 12

Advancing to step 2:
12 can be fit into 63 5 times, resulting in a remainder of 3.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
If we take 60 away from 63, we end up with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 12

On to step 3:
The number 12 fits into 39 3 times, leaving a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
Subtracting 36 from 39 leaves us with 3.
Include the next digit (7) from the dividend after 3, then repeat: 37 / 12

Let's proceed to step 4:
If we divide 37 by 12, we get 3 and a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 533.0
Subtract 36 from 37 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 12

On to step 5:
10 divided by 12 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 5330.0
Subtracting 0 from 10 leaves us with 10.
Fetch the next digit (0) from the dividend, attach it to 10 and continue: 100 / 12

Step 6:
The number 12 fits into 100 8 times, leaving a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 53308.0
If we subtract 96 from 100, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 53308.3
If we take 36 away from 40, we end up 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.

Moving on to step 8:
The number 12 fits into 40 3 times, leaving a remainder of 4.
Record the quotient 3 as the next digit in the result. 
Result so far: 53308.33
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 53308.33, with a leftover of 0.004.