855680 ÷ 66 
The aim is to understand the frequency of 66 in 855680.

Advancing to step 1:
8 divided by 66 is 0 with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 66

Advancing to step 2:
When dividing 85 by 66, we get 1 with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 66 away from 85, we end up with 19.
Include the next digit (5) from the dividend after 19, then repeat: 195 / 66

On to step 3:
66 can be fit into 195 2 times, resulting in a remainder of 63.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Deduct 132 from 195 and we're left with 63.
Fetch the next digit (6) from the dividend, attach it to 63 and continue: 636 / 66

Going ahead to step 4:
66 can be fit into 636 9 times, resulting in a remainder of 42.
The next digit of our result is 9. 
Result so far: 129.0
The remainder is 42 after subtracting 594 from 636.
Include the next digit (8) from the dividend after 42, then repeat: 428 / 66

Step 5:
The number 66 fits into 428 6 times, leaving a remainder of 32.
Write down 6 as next digit of the result. 
Result so far: 1296.0
Deduct 396 from 428 and we're left with 32.
Take the next digit (0) from the dividend and append it to 32, then repeat: 320 / 66

Advancing to step 6:
If we divide 320 by 66, we get 4 and a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 12964.0
The remainder is 56 after subtracting 264 from 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 7:
If we divide 560 by 66, we get 8 and a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 12964.8
Subtracting 528 from 560 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 8:
66 goes into 320 4 times with a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 12964.84
Subtracting 264 from 320 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 9:
66 can be fit into 560 8 times, resulting in a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 12964.848
Subtract 528 from 560 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 10:
66 can be fit into 320 4 times, resulting in a remainder of 56.
The next digit of our result is 4. 
Result so far: 12964.8484
Subtract 264 from 320 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 11:
The number 66 fits into 560 8 times, leaving a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 12964.84848
Subtract 528 from 560 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Going ahead to step 12:
The number 66 fits into 320 4 times, leaving a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 12964.848484
Subtract 264 from 320 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 13:
The number 66 fits into 560 8 times, leaving a remainder of 32.
The next digit of our result is 8. 
Result so far: 12964.8484848
The remainder is 32 after subtracting 528 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 14:
66 can be fit into 320 4 times, resulting in a remainder of 56.
The number 4 becomes the next digit in our result. 
Result so far: 12964.84848484
If we subtract 264 from 320, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

The final result is 12964.84848484 with a remainder of 5.6e-08.