Let's divide 406812 by 66
The aim is to understand the frequency of 66 in 406812.

Advancing to step 1:
When dividing 4 by 66, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 66

Advancing to step 2:
40 divided by 66 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 40, we end up with 40.
Bring next digit (6) of the dividend behind the 40 and repeat the process: 406 / 66

Moving on to step 3:
66 goes into 406 6 times with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 396 away from 406, we end up with 10.
Fetch the next digit (8) from the dividend, attach it to 10 and continue: 108 / 66

Moving on to step 4:
The number 66 fits into 108 1 times, leaving a remainder of 42.
Use 1 as the next digit of our solution. 
Result so far: 61.0
The remainder is 42 after subtracting 66 from 108.
Take the next digit (1) from the dividend and append it to 42, then repeat: 421 / 66

Step 5:
66 can be fit into 421 6 times, resulting in a remainder of 25.
Write down 6 as next digit of the result. 
Result so far: 616.0
If we subtract 396 from 421, we get 25.
Fetch the next digit (2) from the dividend, attach it to 25 and continue: 252 / 66

Going ahead to step 6:
The number 66 fits into 252 3 times, leaving a remainder of 54.
Write down 3 as next digit of the result. 
Result so far: 6163.0
If we subtract 198 from 252, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
66 can be fit into 540 8 times, resulting in a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 6163.8
Subtracting 528 from 540 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 8:
When dividing 120 by 66, we get 1 with a remainder of 54.
Put 1 as the next digit of the answer. 
Result so far: 6163.81
The remainder is 54 after subtracting 66 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 9:
The number 66 fits into 540 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 6163.818
The remainder is 12 after subtracting 528 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 10:
66 goes into 120 1 times with a remainder of 54.
Use 1 as the next digit of our solution. 
Result so far: 6163.8181
Deduct 66 from 120 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 11:
66 goes into 540 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 6163.81818
Deduct 528 from 540 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 12:
66 can be fit into 120 1 times, resulting in a remainder of 54.
The next digit of our result is 1. 
Result so far: 6163.818181
If we subtract 66 from 120, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 13:
540 divided by 66 is 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 6163.8181818
Deduct 528 from 540 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 14:
66 goes into 120 1 times with a remainder of 54.
The next digit of our result is 1. 
Result so far: 6163.81818181
Subtract 66 from 120 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

After the division, we end up with 6163.81818181 and a remainder of 5.4e-08.