We look at the division of 635088 by 99 
The aim is to understand the frequency of 99 in 635088.

On to step 1:
99 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 99

Step 2:
The number 99 fits into 63 0 times, leaving a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 63 leaves us with 63.
Take the next digit (5) from the dividend and append it to 63, then repeat: 635 / 99

Advancing to step 3:
99 goes into 635 6 times with a remainder of 41.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
If we subtract 594 from 635, we get 41.
Fetch the next digit (0) from the dividend, attach it to 41 and continue: 410 / 99

Moving on to step 4:
99 can be fit into 410 4 times, resulting in a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 64.0
Subtracting 396 from 410 leaves us with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 99

On to step 5:
When dividing 148 by 99, we get 1 with a remainder of 49.
The next digit of our result is 1. 
Result so far: 641.0
Subtract 99 from 148 to get 49.
Fetch the next digit (8) from the dividend, attach it to 49 and continue: 498 / 99

Advancing to step 6:
If we divide 498 by 99, we get 5 and a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 6415.0
Deduct 495 from 498 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 7:
When dividing 30 by 99, we get 0 with a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 6415.0
If we subtract 0 from 30, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 8:
99 goes into 300 3 times with a remainder of 3.
The next digit of our result is 3. 
Result so far: 6415.03
If we take 297 away from 300, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 9:
The number 99 fits into 30 0 times, leaving a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 6415.03
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 10:
When dividing 300 by 99, we get 3 with a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 6415.0303
Deduct 297 from 300 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 11:
The number 99 fits into 30 0 times, leaving a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 6415.0303
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 12:
The number 99 fits into 300 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 6415.030303
If we take 297 away from 300, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 13:
99 goes into 30 0 times with a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 6415.030303
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 14:
99 can be fit into 300 3 times, resulting in a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 6415.03030303
If we take 297 away from 300, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 6415.03030303, with a leftover of 3e-09.