We look at the division of 863538 by 99 
The aim is to understand the frequency of 99 in 863538.

On to step 1:
If we divide 8 by 99, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 99

Moving on to step 2:
When dividing 86 by 99, we get 0 with a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Include the next digit (3) from the dividend after 86, then repeat: 863 / 99

Going ahead to step 3:
99 goes into 863 8 times with a remainder of 71.
The next digit of our result is 8. 
Result so far: 8.0
If we take 792 away from 863, we end up with 71.
Append the next digit (5) from the dividend to 71 and continue with: 715 / 99

Moving on to step 4:
When dividing 715 by 99, we get 7 with a remainder of 22.
Put 7 as the next digit of the answer. 
Result so far: 87.0
If we subtract 693 from 715, we get 22.
Append the next digit (3) from the dividend to 22 and continue with: 223 / 99

Going ahead to step 5:
If we divide 223 by 99, we get 2 and a remainder of 25.
The number 2 becomes the next digit in our result. 
Result so far: 872.0
Subtracting 198 from 223 leaves us with 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 99

Step 6:
If we divide 258 by 99, we get 2 and a remainder of 60.
Write down 2 as next digit of the result. 
Result so far: 8722.0
The remainder is 60 after subtracting 198 from 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 7:
99 goes into 600 6 times with a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 8722.6
Deduct 594 from 600 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 8:
99 can be fit into 60 0 times, resulting in a remainder of 60.
The next digit of our result is 0. 
Result so far: 8722.6
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
If we divide 600 by 99, we get 6 and a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 8722.606
Deduct 594 from 600 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 10:
60 divided by 99 is 0 with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 8722.606
If we take 0 away from 60, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Going ahead to step 11:
The number 99 fits into 600 6 times, leaving a remainder of 6.
Use 6 as the next digit of our solution. 
Result so far: 8722.60606
The remainder is 6 after subtracting 594 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 12:
If we divide 60 by 99, we get 0 and a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 8722.60606
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 13:
600 divided by 99 is 6 with a remainder of 6.
The next digit of our result is 6. 
Result so far: 8722.6060606
If we subtract 594 from 600, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 14:
99 goes into 60 0 times with a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 8722.6060606
Subtracting 0 from 60 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Our division results in 8722.6060606 with a remaining 6e-08.