We look at the division of 570655 by 66 
The aim is to understand the frequency of 66 in 570655.

Step 1:
66 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 66

Advancing to step 2:
When dividing 57 by 66, we get 0 with a remainder of 57.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 57 after subtracting 0 from 57.
Take the next digit (0) from the dividend and append it to 57, then repeat: 570 / 66

On to step 3:
When dividing 570 by 66, we get 8 with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 528 from 570 leaves us with 42.
Take the next digit (6) from the dividend and append it to 42, then repeat: 426 / 66

Advancing to step 4:
The number 66 fits into 426 6 times, leaving a remainder of 30.
Put 6 as the next digit of the answer. 
Result so far: 86.0
If we take 396 away from 426, we end up with 30.
Append the next digit (5) from the dividend to 30 and continue with: 305 / 66

Moving on to step 5:
The number 66 fits into 305 4 times, leaving a remainder of 41.
The next digit of our result is 4. 
Result so far: 864.0
Subtracting 264 from 305 leaves us with 41.
Grab the next digit (5) from the dividend, add it to 41, then carry on: 415 / 66

Step 6:
415 divided by 66 is 6 with a remainder of 19.
Use 6 as the next digit of our solution. 
Result so far: 8646.0
If we subtract 396 from 415, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
66 goes into 190 2 times with a remainder of 58.
The number 2 becomes the next digit in our result. 
Result so far: 8646.2
Subtract 132 from 190 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Advancing to step 8:
580 divided by 66 is 8 with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 8646.28
Deduct 528 from 580 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 9:
If we divide 520 by 66, we get 7 and a remainder of 58.
The number 7 becomes the next digit in our result. 
Result so far: 8646.287
Deduct 462 from 520 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 10:
The number 66 fits into 580 8 times, leaving a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 8646.2878
The remainder is 52 after subtracting 528 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 11:
520 divided by 66 is 7 with a remainder of 58.
The next digit of our result is 7. 
Result so far: 8646.28787
If we subtract 462 from 520, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 12:
If we divide 580 by 66, we get 8 and a remainder of 52.
Record the quotient 8 as the next digit in the result. 
Result so far: 8646.287878
Deduct 528 from 580 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Step 13:
If we divide 520 by 66, we get 7 and a remainder of 58.
Put 7 as the next digit of the answer. 
Result so far: 8646.2878787
If we subtract 462 from 520, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 14:
The number 66 fits into 580 8 times, leaving a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 8646.28787878
Subtracting 528 from 580 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

The final result is 8646.28787878 with a remainder of 5.2e-08.