990427 ÷ 99 
The aim is to understand the frequency of 99 in 990427.

Moving on to step 1:
99 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 99

Going ahead to step 2:
99 divided by 99 is 1 with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 99 from 99 and we're left with 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 99

Advancing to step 3:
99 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 0 to get 0.
Take the next digit (4) from the dividend and append it to 0, then repeat: 4 / 99

Let's proceed to step 4:
99 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 100.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 99

Advancing to step 5:
The number 99 fits into 42 0 times, leaving a remainder of 42.
The next digit of our result is 0. 
Result so far: 1000.0
If we subtract 0 from 42, we get 42.
Append the next digit (7) from the dividend to 42 and continue with: 427 / 99

Going ahead to step 6:
99 can be fit into 427 4 times, resulting in a remainder of 31.
Use 4 as the next digit of our solution. 
Result so far: 10004.0
The remainder is 31 after subtracting 396 from 427.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 7:
When dividing 310 by 99, we get 3 with a remainder of 13.
The next digit of our result is 3. 
Result so far: 10004.3
Deduct 297 from 310 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 8:
When dividing 130 by 99, we get 1 with a remainder of 31.
Use 1 as the next digit of our solution. 
Result so far: 10004.31
The remainder is 31 after subtracting 99 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 9:
When dividing 310 by 99, we get 3 with a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 10004.313
Deduct 297 from 310 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 10:
99 can be fit into 130 1 times, resulting in a remainder of 31.
The number 1 becomes the next digit in our result. 
Result so far: 10004.3131
Subtracting 99 from 130 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 11:
The number 99 fits into 310 3 times, leaving a remainder of 13.
The next digit of our result is 3. 
Result so far: 10004.31313
Deduct 297 from 310 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Going ahead to step 12:
When dividing 130 by 99, we get 1 with a remainder of 31.
Write down 1 as next digit of the result. 
Result so far: 10004.313131
Subtracting 99 from 130 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Moving on to step 13:
The number 99 fits into 310 3 times, leaving a remainder of 13.
Write down 3 as next digit of the result. 
Result so far: 10004.3131313
If we take 297 away from 310, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 14:
99 can be fit into 130 1 times, resulting in a remainder of 31.
The number 1 becomes the next digit in our result. 
Result so far: 10004.31313131
If we take 99 away from 130, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Our division results in 10004.31313131 with a remaining 3.1e-08.