We look at the division of 804531 by 99 
The aim is to understand the frequency of 99 in 804531.

Moving on to step 1:
When dividing 8 by 99, we get 0 with 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.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 99

Going ahead to step 2:
80 divided by 99 is 0 with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Fetch the next digit (4) from the dividend, attach it to 80 and continue: 804 / 99

Going ahead to step 3:
When dividing 804 by 99, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 792 from 804 and we're left with 12.
Fetch the next digit (5) from the dividend, attach it to 12 and continue: 125 / 99

Let's proceed to step 4:
99 can be fit into 125 1 times, resulting in a remainder of 26.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
The remainder is 26 after subtracting 99 from 125.
Append the next digit (3) from the dividend to 26 and continue with: 263 / 99

On to step 5:
The number 99 fits into 263 2 times, leaving a remainder of 65.
The number 2 becomes the next digit in our result. 
Result so far: 812.0
Deduct 198 from 263 and we're left with 65.
Grab the next digit (1) from the dividend, add it to 65, then carry on: 651 / 99

Moving on to step 6:
When dividing 651 by 99, we get 6 with a remainder of 57.
Use 6 as the next digit of our solution. 
Result so far: 8126.0
The remainder is 57 after subtracting 594 from 651.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 7:
The number 99 fits into 570 5 times, leaving a remainder of 75.
The next digit of our result is 5. 
Result so far: 8126.5
Deduct 495 from 570 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 8:
99 can be fit into 750 7 times, resulting in a remainder of 57.
The next digit of our result is 7. 
Result so far: 8126.57
If we take 693 away from 750, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

On to step 9:
If we divide 570 by 99, we get 5 and a remainder of 75.
The next digit of our result is 5. 
Result so far: 8126.575
Deduct 495 from 570 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Step 10:
99 goes into 750 7 times with a remainder of 57.
Put 7 as the next digit of the answer. 
Result so far: 8126.5757
Subtracting 693 from 750 leaves us with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Moving on to step 11:
99 can be fit into 570 5 times, resulting in a remainder of 75.
The number 5 becomes the next digit in our result. 
Result so far: 8126.57575
If we subtract 495 from 570, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 12:
If we divide 750 by 99, we get 7 and a remainder of 57.
Use 7 as the next digit of our solution. 
Result so far: 8126.575757
Deduct 693 from 750 and we're left with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Going ahead to step 13:
99 goes into 570 5 times with a remainder of 75.
Record the quotient 5 as the next digit in the result. 
Result so far: 8126.5757575
If we subtract 495 from 570, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 14:
The number 99 fits into 750 7 times, leaving a remainder of 57.
Write down 7 as next digit of the result. 
Result so far: 8126.57575757
If we take 693 away from 750, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

The final result is 8126.57575757 with a remainder of 5.7e-08.