We're dividing 828507 by 66 
The aim is to understand the frequency of 66 in 828507.

Going ahead to step 1:
8 divided by 66 is 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (2) from the dividend, add it to 8, then carry on: 82 / 66

On to step 2:
66 can be fit into 82 1 times, resulting in a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 66 from 82, we get 16.
Grab the next digit (8) from the dividend, add it to 16, then carry on: 168 / 66

Step 3:
66 goes into 168 2 times with a remainder of 36.
Use 2 as the next digit of our solution. 
Result so far: 12.0
The remainder is 36 after subtracting 132 from 168.
Fetch the next digit (5) from the dividend, attach it to 36 and continue: 365 / 66

Going ahead to step 4:
365 divided by 66 is 5 with a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 125.0
Subtract 330 from 365 to get 35.
Bring next digit (0) of the dividend behind the 35 and repeat the process: 350 / 66

Going ahead to step 5:
When dividing 350 by 66, we get 5 with a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 1255.0
The remainder is 20 after subtracting 330 from 350.
Bring next digit (7) of the dividend behind the 20 and repeat the process: 207 / 66

Moving on to step 6:
66 goes into 207 3 times with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 12553.0
Subtracting 198 from 207 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
The number 66 fits into 90 1 times, leaving a remainder of 24.
Put 1 as the next digit of the answer. 
Result so far: 12553.1
If we subtract 66 from 90, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 8:
66 goes into 240 3 times with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 12553.13
Subtract 198 from 240 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 9:
420 divided by 66 is 6 with a remainder of 24.
Put 6 as the next digit of the answer. 
Result so far: 12553.136
If we subtract 396 from 420, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 10:
The number 66 fits into 240 3 times, leaving a remainder of 42.
The next digit of our result is 3. 
Result so far: 12553.1363
Subtracting 198 from 240 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Let's proceed to step 11:
420 divided by 66 is 6 with a remainder of 24.
The next digit of our result is 6. 
Result so far: 12553.13636
If we subtract 396 from 420, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 12:
When dividing 240 by 66, we get 3 with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 12553.136363
Subtracting 198 from 240 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 13:
66 goes into 420 6 times with a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 12553.1363636
Subtract 396 from 420 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 14:
The number 66 fits into 240 3 times, leaving a remainder of 42.
The number 3 becomes the next digit in our result. 
Result so far: 12553.13636363
If we subtract 198 from 240, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Our division results in 12553.13636363 with a remaining 4.2e-08.