385541 ÷ 90 
The aim is to understand the frequency of 90 in 385541.

On to step 1:
The number 90 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Append the next digit (8) from the dividend to 3 and continue with: 38 / 90

Step 2:
90 can be fit into 38 0 times, resulting in a remainder of 38.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 38, we get 38.
Grab the next digit (5) from the dividend, add it to 38, then carry on: 385 / 90

Step 3:
90 goes into 385 4 times with a remainder of 25.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 360 away from 385, we end up with 25.
Bring next digit (5) of the dividend behind the 25 and repeat the process: 255 / 90

Let's proceed to step 4:
90 goes into 255 2 times with a remainder of 75.
Put 2 as the next digit of the answer. 
Result so far: 42.0
The remainder is 75 after subtracting 180 from 255.
Bring next digit (4) of the dividend behind the 75 and repeat the process: 754 / 90

On to step 5:
If we divide 754 by 90, we get 8 and a remainder of 34.
Write down 8 as next digit of the result. 
Result so far: 428.0
If we take 720 away from 754, we end up with 34.
Grab the next digit (1) from the dividend, add it to 34, then carry on: 341 / 90

Let's proceed to step 6:
If we divide 341 by 90, we get 3 and a remainder of 71.
The number 3 becomes the next digit in our result. 
Result so far: 4283.0
Subtracting 270 from 341 leaves us with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 7:
90 can be fit into 710 7 times, resulting in a remainder of 80.
Use 7 as the next digit of our solution. 
Result so far: 4283.7
Subtracting 630 from 710 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 8:
800 divided by 90 is 8 with a remainder of 80.
Write down 8 as next digit of the result. 
Result so far: 4283.78
Deduct 720 from 800 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
800 divided by 90 is 8 with a remainder of 80.
The next digit of our result is 8. 
Result so far: 4283.788
If we subtract 720 from 800, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

The final result is 4283.788 with a remainder of 0.008.