We're dividing 308909 by 85 
The aim is to understand the frequency of 85 in 308909.

Advancing to step 1:
If we divide 3 by 85, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (0) from the dividend to 3 and continue with: 30 / 85

Going ahead to step 2:
30 divided by 85 is 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 30, we end up with 30.
Bring next digit (8) of the dividend behind the 30 and repeat the process: 308 / 85

Let's proceed to step 3:
When dividing 308 by 85, we get 3 with a remainder of 53.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we subtract 255 from 308, we get 53.
Bring next digit (9) of the dividend behind the 53 and repeat the process: 539 / 85

Let's proceed to step 4:
If we divide 539 by 85, we get 6 and a remainder of 29.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
If we take 510 away from 539, we end up with 29.
Include the next digit (0) from the dividend after 29, then repeat: 290 / 85

Advancing to step 5:
When dividing 290 by 85, we get 3 with a remainder of 35.
The next digit of our result is 3. 
Result so far: 363.0
If we take 255 away from 290, we end up with 35.
Grab the next digit (9) from the dividend, add it to 35, then carry on: 359 / 85

Going ahead to step 6:
85 goes into 359 4 times with a remainder of 19.
Record the quotient 4 as the next digit in the result. 
Result so far: 3634.0
Subtracting 340 from 359 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 7:
When dividing 190 by 85, we get 2 with a remainder of 20.
Write down 2 as next digit of the result. 
Result so far: 3634.2
Subtracting 170 from 190 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
If we divide 200 by 85, we get 2 and a remainder of 30.
Use 2 as the next digit of our solution. 
Result so far: 3634.22
Deduct 170 from 200 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final result is 3634.22 with a remainder of 0.03.