We look at the division of 156649 by 99 
The aim is to understand the frequency of 99 in 156649.

On to step 1:
1 divided by 99 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 99

Step 2:
The number 99 fits into 15 0 times, leaving a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Grab the next digit (6) from the dividend, add it to 15, then carry on: 156 / 99

Advancing to step 3:
If we divide 156 by 99, we get 1 and a remainder of 57.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 99 from 156 to get 57.
Include the next digit (6) from the dividend after 57, then repeat: 576 / 99

On to step 4:
99 goes into 576 5 times with a remainder of 81.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Deduct 495 from 576 and we're left with 81.
Include the next digit (4) from the dividend after 81, then repeat: 814 / 99

Step 5:
The number 99 fits into 814 8 times, leaving a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 158.0
The remainder is 22 after subtracting 792 from 814.
Bring next digit (9) of the dividend behind the 22 and repeat the process: 229 / 99

On to step 6:
99 can be fit into 229 2 times, resulting in a remainder of 31.
The number 2 becomes the next digit in our result. 
Result so far: 1582.0
If we take 198 away from 229, 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.

On to step 7:
99 can be fit into 310 3 times, resulting in a remainder of 13.
The number 3 becomes the next digit in our result. 
Result so far: 1582.3
Subtracting 297 from 310 leaves us 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.

Moving on to step 8:
130 divided by 99 is 1 with a remainder of 31.
The next digit of our result is 1. 
Result so far: 1582.31
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.

Step 9:
When dividing 310 by 99, we get 3 with a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 1582.313
Subtract 297 from 310 to get 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 10:
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: 1582.3131
Deduct 99 from 130 and we're left 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.

Advancing to step 11:
310 divided by 99 is 3 with a remainder of 13.
The next digit of our result is 3. 
Result so far: 1582.31313
Subtract 297 from 310 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 12:
130 divided by 99 is 1 with a remainder of 31.
Use 1 as the next digit of our solution. 
Result so far: 1582.313131
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.

Moving on to step 13:
99 goes into 310 3 times with a remainder of 13.
Use 3 as the next digit of our solution. 
Result so far: 1582.3131313
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.

Let's proceed to step 14:
99 goes into 130 1 times with a remainder of 31.
The next digit of our result is 1. 
Result so far: 1582.31313131
Deduct 99 from 130 and we're left 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.

The final result is 1582.31313131 with a remainder of 3.1e-08.