686148 divided by 12 
The aim is to understand the frequency of 12 in 686148.

Let's proceed to step 1:
When dividing 6 by 12, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 12

On to step 2:
12 can be fit into 68 5 times, resulting in a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtracting 60 from 68 leaves us with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 12

On to step 3:
12 goes into 86 7 times with a remainder of 2.
Record the quotient 7 as the next digit in the result. 
Result so far: 57.0
Subtract 84 from 86 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 12

Moving on to step 4:
12 goes into 21 1 times with a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 571.0
The remainder is 9 after subtracting 12 from 21.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 12

Let's proceed to step 5:
12 can be fit into 94 7 times, resulting in a remainder of 10.
Use 7 as the next digit of our solution. 
Result so far: 5717.0
If we subtract 84 from 94, we get 10.
Take the next digit (8) from the dividend and append it to 10, then repeat: 108 / 12

Going ahead to step 6:
12 can be fit into 108 9 times, resulting in a remainder of 0.
The number 9 becomes the next digit in our result. 
Result so far: 57179.0
The remainder is 0 after subtracting 108 from 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
When dividing 0 by 12, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 57179.0
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.

Moving on to step 8:
The number 12 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 57179.0
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.

The final outcome is 57179.0, with a leftover of 0.0.