We look at the division of 401685 by 99 
The aim is to understand the frequency of 99 in 401685.

Let's proceed to step 1:
When dividing 4 by 99, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 99

Step 2:
When dividing 40 by 99, we get 0 with a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 40, we get 40.
Grab the next digit (1) from the dividend, add it to 40, then carry on: 401 / 99

Let's proceed to step 3:
When dividing 401 by 99, we get 4 with a remainder of 5.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 5 after subtracting 396 from 401.
Append the next digit (6) from the dividend to 5 and continue with: 56 / 99

Step 4:
56 divided by 99 is 0 with a remainder of 56.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Subtracting 0 from 56 leaves us with 56.
Grab the next digit (8) from the dividend, add it to 56, then carry on: 568 / 99

Advancing to step 5:
If we divide 568 by 99, we get 5 and a remainder of 73.
The number 5 becomes the next digit in our result. 
Result so far: 405.0
Deduct 495 from 568 and we're left with 73.
Include the next digit (5) from the dividend after 73, then repeat: 735 / 99

Moving on to step 6:
When dividing 735 by 99, we get 7 with a remainder of 42.
Record the quotient 7 as the next digit in the result. 
Result so far: 4057.0
Deduct 693 from 735 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
The number 99 fits into 420 4 times, leaving a remainder of 24.
The next digit of our result is 4. 
Result so far: 4057.4
Deduct 396 from 420 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 8:
99 can be fit into 240 2 times, resulting in a remainder of 42.
The next digit of our result is 2. 
Result so far: 4057.42
If we subtract 198 from 240, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 9:
420 divided by 99 is 4 with a remainder of 24.
Use 4 as the next digit of our solution. 
Result so far: 4057.424
The remainder is 24 after subtracting 396 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 10:
If we divide 240 by 99, we get 2 and a remainder of 42.
The next digit of our result is 2. 
Result so far: 4057.4242
The remainder is 42 after subtracting 198 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 11:
If we divide 420 by 99, we get 4 and a remainder of 24.
Write down 4 as next digit of the result. 
Result so far: 4057.42424
Subtract 396 from 420 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 12:
99 can be fit into 240 2 times, resulting in a remainder of 42.
Record the quotient 2 as the next digit in the result. 
Result so far: 4057.424242
Subtracting 198 from 240 leaves us with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 13:
420 divided by 99 is 4 with a remainder of 24.
The number 4 becomes the next digit in our result. 
Result so far: 4057.4242424
Subtracting 396 from 420 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 14:
240 divided by 99 is 2 with a remainder of 42.
Use 2 as the next digit of our solution. 
Result so far: 4057.42424242
The remainder is 42 after subtracting 198 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

The final outcome is 4057.42424242, with a leftover of 4.2e-08.