We're dividing 91607766 by 99 
The aim is to understand the frequency of 99 in 91607766.

Step 1:
When dividing 9 by 99, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 99

On to step 2:
The number 99 fits into 91 0 times, leaving a remainder of 91.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 91 leaves us with 91.
Fetch the next digit (6) from the dividend, attach it to 91 and continue: 916 / 99

Moving on to step 3:
If we divide 916 by 99, we get 9 and a remainder of 25.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 891 from 916 leaves us with 25.
Include the next digit (0) from the dividend after 25, then repeat: 250 / 99

Let's proceed to step 4:
If we divide 250 by 99, we get 2 and a remainder of 52.
Use 2 as the next digit of our solution. 
Result so far: 92.0
Subtract 198 from 250 to get 52.
Bring next digit (7) of the dividend behind the 52 and repeat the process: 527 / 99

Moving on to step 5:
When dividing 527 by 99, we get 5 with a remainder of 32.
Write down 5 as next digit of the result. 
Result so far: 925.0
If we subtract 495 from 527, we get 32.
Include the next digit (7) from the dividend after 32, then repeat: 327 / 99

Advancing to step 6:
When dividing 327 by 99, we get 3 with a remainder of 30.
The next digit of our result is 3. 
Result so far: 9253.0
If we take 297 away from 327, we end up with 30.
Take the next digit (6) from the dividend and append it to 30, then repeat: 306 / 99

Going ahead to step 7:
If we divide 306 by 99, we get 3 and a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 92533.0
The remainder is 9 after subtracting 297 from 306.
Append the next digit (6) from the dividend to 9 and continue with: 96 / 99

Moving on to step 8:
99 goes into 96 0 times with a remainder of 96.
Put 0 as the next digit of the answer. 
Result so far: 925330.0
Subtracting 0 from 96 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 9:
If we divide 960 by 99, we get 9 and a remainder of 69.
Put 9 as the next digit of the answer. 
Result so far: 925330.9
The remainder is 69 after subtracting 891 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Let's proceed to step 10:
99 goes into 690 6 times with a remainder of 96.
Use 6 as the next digit of our solution. 
Result so far: 925330.96
Subtracting 594 from 690 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 11:
99 can be fit into 960 9 times, resulting in a remainder of 69.
The next digit of our result is 9. 
Result so far: 925330.969
The remainder is 69 after subtracting 891 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Advancing to step 12:
The number 99 fits into 690 6 times, leaving a remainder of 96.
Put 6 as the next digit of the answer. 
Result so far: 925330.9696
Subtract 594 from 690 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 13:
99 goes into 960 9 times with a remainder of 69.
Write down 9 as next digit of the result. 
Result so far: 925330.96969
Subtracting 891 from 960 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 14:
The number 99 fits into 690 6 times, leaving a remainder of 96.
Use 6 as the next digit of our solution. 
Result so far: 925330.969696
Subtract 594 from 690 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Advancing to step 15:
When dividing 960 by 99, we get 9 with a remainder of 69.
The next digit of our result is 9. 
Result so far: 925330.9696969
If we subtract 891 from 960, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 16:
99 can be fit into 690 6 times, resulting in a remainder of 96.
The next digit of our result is 6. 
Result so far: 925330.96969696
Deduct 594 from 690 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

The final outcome is 925330.96969696, with a leftover of 9.6e-08.