872505 divided by 99 
The aim is to understand the frequency of 99 in 872505.

On to step 1:
When dividing 8 by 99, we get 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 99

Advancing to step 2:
87 divided by 99 is 0 with a remainder of 87.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 87 to get 87.
Take the next digit (2) from the dividend and append it to 87, then repeat: 872 / 99

Let's proceed to step 3:
If we divide 872 by 99, we get 8 and a remainder of 80.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 792 from 872 leaves us with 80.
Append the next digit (5) from the dividend to 80 and continue with: 805 / 99

Step 4:
99 goes into 805 8 times with a remainder of 13.
Use 8 as the next digit of our solution. 
Result so far: 88.0
Subtracting 792 from 805 leaves us with 13.
Include the next digit (0) from the dividend after 13, then repeat: 130 / 99

Advancing to step 5:
99 can be fit into 130 1 times, resulting in a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 881.0
Subtract 99 from 130 to get 31.
Include the next digit (5) from the dividend after 31, then repeat: 315 / 99

On to step 6:
99 goes into 315 3 times with a remainder of 18.
Write down 3 as next digit of the result. 
Result so far: 8813.0
Deduct 297 from 315 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 7:
If we divide 180 by 99, we get 1 and a remainder of 81.
The next digit of our result is 1. 
Result so far: 8813.1
The remainder is 81 after subtracting 99 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 8:
If we divide 810 by 99, we get 8 and a remainder of 18.
The number 8 becomes the next digit in our result. 
Result so far: 8813.18
Subtracting 792 from 810 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 9:
When dividing 180 by 99, we get 1 with a remainder of 81.
Use 1 as the next digit of our solution. 
Result so far: 8813.181
Deduct 99 from 180 and we're left with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Step 10:
99 can be fit into 810 8 times, resulting in a remainder of 18.
The next digit of our result is 8. 
Result so far: 8813.1818
Deduct 792 from 810 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 11:
99 can be fit into 180 1 times, resulting in a remainder of 81.
The next digit of our result is 1. 
Result so far: 8813.18181
If we subtract 99 from 180, we get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 12:
If we divide 810 by 99, we get 8 and a remainder of 18.
The next digit of our result is 8. 
Result so far: 8813.181818
If we subtract 792 from 810, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 13:
When dividing 180 by 99, we get 1 with a remainder of 81.
Put 1 as the next digit of the answer. 
Result so far: 8813.1818181
If we subtract 99 from 180, we get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Let's proceed to step 14:
99 can be fit into 810 8 times, resulting in a remainder of 18.
Record the quotient 8 as the next digit in the result. 
Result so far: 8813.18181818
If we take 792 away from 810, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Our division results in 8813.18181818 with a remaining 1.8e-08.