199395 divided by 90 
The aim is to understand the frequency of 90 in 199395.

Moving on to step 1:
90 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 90

Going ahead to step 2:
19 divided by 90 is 0 with a remainder of 19.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 19, we get 19.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 90

Advancing to step 3:
90 goes into 199 2 times with a remainder of 19.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 180 from 199, we get 19.
Append the next digit (3) from the dividend to 19 and continue with: 193 / 90

On to step 4:
90 goes into 193 2 times with a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 22.0
Subtract 180 from 193 to get 13.
Bring next digit (9) of the dividend behind the 13 and repeat the process: 139 / 90

Let's proceed to step 5:
90 goes into 139 1 times with a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 221.0
Deduct 90 from 139 and we're left with 49.
Bring next digit (5) of the dividend behind the 49 and repeat the process: 495 / 90

Moving on to step 6:
When dividing 495 by 90, we get 5 with a remainder of 45.
The next digit of our result is 5. 
Result so far: 2215.0
If we subtract 450 from 495, we get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 7:
90 can be fit into 450 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 2215.5
Subtract 450 from 450 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
When dividing 0 by 90, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 2215.5
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 9:
The number 90 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 2215.5
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 2215.5 with a remainder of 0.0.