353175 ÷ 90 
The aim is to understand the frequency of 90 in 353175.

Going ahead to step 1:
90 can be fit into 3 0 times, resulting in a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 90

On to step 2:
90 can be fit into 35 0 times, resulting in a remainder of 35.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 35 to get 35.
Include the next digit (3) from the dividend after 35, then repeat: 353 / 90

Step 3:
When dividing 353 by 90, we get 3 with a remainder of 83.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 270 from 353 leaves us with 83.
Fetch the next digit (1) from the dividend, attach it to 83 and continue: 831 / 90

On to step 4:
If we divide 831 by 90, we get 9 and a remainder of 21.
Write down 9 as next digit of the result. 
Result so far: 39.0
If we subtract 810 from 831, we get 21.
Grab the next digit (7) from the dividend, add it to 21, then carry on: 217 / 90

Step 5:
90 can be fit into 217 2 times, resulting in a remainder of 37.
The next digit of our result is 2. 
Result so far: 392.0
If we subtract 180 from 217, we get 37.
Include the next digit (5) from the dividend after 37, then repeat: 375 / 90

Let's proceed to step 6:
If we divide 375 by 90, we get 4 and a remainder of 15.
Record the quotient 4 as the next digit in the result. 
Result so far: 3924.0
Subtract 360 from 375 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
When dividing 150 by 90, we get 1 with a remainder of 60.
The next digit of our result is 1. 
Result so far: 3924.1
The remainder is 60 after subtracting 90 from 150.
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 8:
90 goes into 600 6 times with a remainder of 60.
Use 6 as the next digit of our solution. 
Result so far: 3924.16
Subtracting 540 from 600 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.

Moving on to step 9:
90 can be fit into 600 6 times, resulting in a remainder of 60.
The next digit of our result is 6. 
Result so far: 3924.166
Deduct 540 from 600 and we're left 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.

The final result is 3924.166 with a remainder of 0.006.