We look at the division of 80511 by 86 
The aim is to understand the frequency of 86 in 80511.

On to step 1:
When dividing 8 by 86, we get 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 86

Let's proceed to step 2:
When dividing 80 by 86, we get 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Bring next digit (5) of the dividend behind the 80 and repeat the process: 805 / 86

Going ahead to step 3:
When dividing 805 by 86, we get 9 with a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
The remainder is 31 after subtracting 774 from 805.
Append the next digit (1) from the dividend to 31 and continue with: 311 / 86

Advancing to step 4:
311 divided by 86 is 3 with a remainder of 53.
Record the quotient 3 as the next digit in the result. 
Result so far: 93.0
Subtract 258 from 311 to get 53.
Take the next digit (1) from the dividend and append it to 53, then repeat: 531 / 86

Let's proceed to step 5:
The number 86 fits into 531 6 times, leaving a remainder of 15.
Write down 6 as next digit of the result. 
Result so far: 936.0
Deduct 516 from 531 and we're left with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 6:
86 goes into 150 1 times with a remainder of 64.
Write down 1 as next digit of the result. 
Result so far: 936.1
If we take 86 away from 150, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Advancing to step 7:
86 can be fit into 640 7 times, resulting in a remainder of 38.
Use 7 as the next digit of our solution. 
Result so far: 936.17
If we take 602 away from 640, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 8:
When dividing 380 by 86, we get 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 936.174
If we take 344 away from 380, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 9:
The number 86 fits into 360 4 times, leaving a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 936.1744
Subtract 344 from 360 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 936.1744 with a remaining 0.00016.