We look at the division of 881688 by 66 
The aim is to understand the frequency of 66 in 881688.

Going ahead to step 1:
The number 66 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 66

Going ahead to step 2:
66 can be fit into 88 1 times, resulting in a remainder of 22.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 66 from 88 leaves us with 22.
Grab the next digit (1) from the dividend, add it to 22, then carry on: 221 / 66

Step 3:
If we divide 221 by 66, we get 3 and a remainder of 23.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtracting 198 from 221 leaves us with 23.
Bring next digit (6) of the dividend behind the 23 and repeat the process: 236 / 66

Moving on to step 4:
66 can be fit into 236 3 times, resulting in a remainder of 38.
Record the quotient 3 as the next digit in the result. 
Result so far: 133.0
If we subtract 198 from 236, we get 38.
Fetch the next digit (8) from the dividend, attach it to 38 and continue: 388 / 66

Moving on to step 5:
The number 66 fits into 388 5 times, leaving a remainder of 58.
Write down 5 as next digit of the result. 
Result so far: 1335.0
The remainder is 58 after subtracting 330 from 388.
Fetch the next digit (8) from the dividend, attach it to 58 and continue: 588 / 66

Moving on to step 6:
When dividing 588 by 66, we get 8 with a remainder of 60.
Record the quotient 8 as the next digit in the result. 
Result so far: 13358.0
The remainder is 60 after subtracting 528 from 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 7:
When dividing 600 by 66, we get 9 with a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 13358.9
Subtract 594 from 600 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
66 can be fit into 60 0 times, resulting in a remainder of 60.
The next digit of our result is 0. 
Result so far: 13358.9
If we subtract 0 from 60, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 9:
600 divided by 66 is 9 with a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 13358.909
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 10:
66 goes into 60 0 times with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 13358.909
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 11:
If we divide 600 by 66, we get 9 and a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 13358.90909
If we take 594 away from 600, 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.

On to step 12:
The number 66 fits into 60 0 times, leaving a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 13358.90909
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 13:
66 can be fit into 600 9 times, resulting in a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 13358.9090909
Subtract 594 from 600 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 14:
The number 66 fits into 60 0 times, leaving a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 13358.9090909
Subtract 0 from 60 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 13358.9090909 with a remainder of 6e-08.