660543 ÷ 12 
The aim is to understand the frequency of 12 in 660543.

Step 1:
12 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 12

Let's proceed to step 2:
If we divide 66 by 12, we get 5 and a remainder of 6.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
If we subtract 60 from 66, we get 6.
Bring next digit (0) of the dividend behind the 6 and repeat the process: 60 / 12

Let's proceed to step 3:
12 can be fit into 60 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 55.0
The remainder is 0 after subtracting 60 from 60.
Include the next digit (5) from the dividend after 0, then repeat: 5 / 12

Moving on to step 4:
12 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 550.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 12

Advancing to step 5:
The number 12 fits into 54 4 times, leaving a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 5504.0
If we subtract 48 from 54, we get 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 12

Step 6:
When dividing 63 by 12, we get 5 with a remainder of 3.
The next digit of our result is 5. 
Result so far: 55045.0
If we take 60 away from 63, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 7:
12 can be fit into 30 2 times, resulting in a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 55045.2
If we take 24 away from 30, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 8:
60 divided by 12 is 5 with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 55045.25
If we take 60 away from 60, 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.

Advancing to step 9:
When dividing 0 by 12, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 55045.25
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
When dividing 0 by 12, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 55045.25
Subtract 0 from 0 to 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.

The quotient of the division is 55045.25, and the remainder is 0.0.