We're dividing 385584 by 99 
The aim is to understand the frequency of 99 in 385584.

Advancing to step 1:
If we divide 3 by 99, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 99

Advancing to step 2:
38 divided by 99 is 0 with a remainder of 38.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 38 leaves us with 38.
Bring next digit (5) of the dividend behind the 38 and repeat the process: 385 / 99

Advancing to step 3:
385 divided by 99 is 3 with a remainder of 88.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 297 from 385 to get 88.
Grab the next digit (5) from the dividend, add it to 88, then carry on: 885 / 99

On to step 4:
When dividing 885 by 99, we get 8 with a remainder of 93.
Write down 8 as next digit of the result. 
Result so far: 38.0
Deduct 792 from 885 and we're left with 93.
Append the next digit (8) from the dividend to 93 and continue with: 938 / 99

On to step 5:
938 divided by 99 is 9 with a remainder of 47.
The number 9 becomes the next digit in our result. 
Result so far: 389.0
The remainder is 47 after subtracting 891 from 938.
Grab the next digit (4) from the dividend, add it to 47, then carry on: 474 / 99

Moving on to step 6:
When dividing 474 by 99, we get 4 with a remainder of 78.
The number 4 becomes the next digit in our result. 
Result so far: 3894.0
The remainder is 78 after subtracting 396 from 474.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Advancing to step 7:
When dividing 780 by 99, we get 7 with a remainder of 87.
Write down 7 as next digit of the result. 
Result so far: 3894.7
Subtracting 693 from 780 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Going ahead to step 8:
99 can be fit into 870 8 times, resulting in a remainder of 78.
The next digit of our result is 8. 
Result so far: 3894.78
If we take 792 away from 870, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Going ahead to step 9:
99 can be fit into 780 7 times, resulting in a remainder of 87.
Record the quotient 7 as the next digit in the result. 
Result so far: 3894.787
The remainder is 87 after subtracting 693 from 780.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

On to step 10:
99 can be fit into 870 8 times, resulting in a remainder of 78.
Put 8 as the next digit of the answer. 
Result so far: 3894.7878
Subtracting 792 from 870 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 11:
780 divided by 99 is 7 with a remainder of 87.
The number 7 becomes the next digit in our result. 
Result so far: 3894.78787
Subtracting 693 from 780 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Step 12:
870 divided by 99 is 8 with a remainder of 78.
The number 8 becomes the next digit in our result. 
Result so far: 3894.787878
Subtracting 792 from 870 leaves us with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 13:
When dividing 780 by 99, we get 7 with a remainder of 87.
The number 7 becomes the next digit in our result. 
Result so far: 3894.7878787
If we subtract 693 from 780, we get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 14:
When dividing 870 by 99, we get 8 with a remainder of 78.
Record the quotient 8 as the next digit in the result. 
Result so far: 3894.78787878
If we subtract 792 from 870, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

After the division, we end up with 3894.78787878 and a remainder of 7.8e-08.