86541 ÷ 18 
The aim is to understand the frequency of 18 in 86541.

Going ahead to step 1:
The number 18 fits into 8 0 times, leaving a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 18

Step 2:
18 can be fit into 86 4 times, resulting in a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtract 72 from 86 to get 14.
Append the next digit (5) from the dividend to 14 and continue with: 145 / 18

Advancing to step 3:
18 goes into 145 8 times with a remainder of 1.
Use 8 as the next digit of our solution. 
Result so far: 48.0
The remainder is 1 after subtracting 144 from 145.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 18

On to step 4:
18 goes into 14 0 times with a remainder of 14.
The next digit of our result is 0. 
Result so far: 480.0
If we subtract 0 from 14, we get 14.
Bring next digit (1) of the dividend behind the 14 and repeat the process: 141 / 18

Advancing to step 5:
If we divide 141 by 18, we get 7 and a remainder of 15.
Put 7 as the next digit of the answer. 
Result so far: 4807.0
Deduct 126 from 141 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.

Going ahead to step 6:
150 divided by 18 is 8 with a remainder of 6.
The next digit of our result is 8. 
Result so far: 4807.8
Subtract 144 from 150 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
18 can be fit into 60 3 times, resulting in a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 4807.83
Subtract 54 from 60 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
18 goes into 60 3 times with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 4807.833
Subtract 54 from 60 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final result is 4807.833 with a remainder of 0.0006.