666310 ÷ 12 
The aim is to understand the frequency of 12 in 666310.

Going ahead to step 1:
The number 12 fits into 6 0 times, leaving a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 12

Advancing to step 2:
12 can be fit into 66 5 times, resulting in a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtract 60 from 66 to get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 12

Step 3:
When dividing 66 by 12, we get 5 with a remainder of 6.
The next digit of our result is 5. 
Result so far: 55.0
If we subtract 60 from 66, we get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 12

Advancing to step 4:
12 can be fit into 63 5 times, resulting in a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 555.0
Subtract 60 from 63 to get 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 12

Going ahead to step 5:
12 goes into 31 2 times with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 5552.0
Subtract 24 from 31 to get 7.
Append the next digit (0) from the dividend to 7 and continue with: 70 / 12

Step 6:
When dividing 70 by 12, we get 5 with a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 55525.0
Deduct 60 from 70 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
When dividing 100 by 12, we get 8 with a remainder of 4.
The next digit of our result is 8. 
Result so far: 55525.8
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.

Going ahead to step 8:
12 can be fit into 40 3 times, resulting in a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 55525.83
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.

Advancing to step 9:
40 divided by 12 is 3 with a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 55525.833
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 result is 55525.833 with a remainder of 0.0004.