90605 ÷ 99 
The aim is to understand the frequency of 99 in 90605.

Going ahead to step 1:
99 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 99

On to step 2:
99 goes into 90 0 times with a remainder of 90.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 90, we end up with 90.
Bring next digit (6) of the dividend behind the 90 and repeat the process: 906 / 99

Moving on to step 3:
99 can be fit into 906 9 times, resulting in a remainder of 15.
The next digit of our result is 9. 
Result so far: 9.0
Subtract 891 from 906 to get 15.
Bring next digit (0) of the dividend behind the 15 and repeat the process: 150 / 99

Going ahead to step 4:
The number 99 fits into 150 1 times, leaving a remainder of 51.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
If we subtract 99 from 150, we get 51.
Bring next digit (5) of the dividend behind the 51 and repeat the process: 515 / 99

Advancing to step 5:
515 divided by 99 is 5 with a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 915.0
The remainder is 20 after subtracting 495 from 515.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 6:
If we divide 200 by 99, we get 2 and a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 915.2
If we subtract 198 from 200, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
The number 99 fits into 20 0 times, leaving a remainder of 20.
The next digit of our result is 0. 
Result so far: 915.2
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
When dividing 200 by 99, we get 2 with a remainder of 2.
Use 2 as the next digit of our solution. 
Result so far: 915.202
If we subtract 198 from 200, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
When dividing 20 by 99, we get 0 with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 915.202
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
If we divide 200 by 99, we get 2 and a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 915.20202
Deduct 198 from 200 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 11:
The number 99 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 915.20202
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 12:
200 divided by 99 is 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 915.2020202
The remainder is 2 after subtracting 198 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 13:
99 goes into 20 0 times with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 915.2020202
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Our division results in 915.2020202 with a remaining 2e-08.