171385 divided by 86 
The aim is to understand the frequency of 86 in 171385.

Moving on to step 1:
The number 86 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 86

Step 2:
86 can be fit into 17 0 times, resulting in a remainder of 17.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 17 to get 17.
Include the next digit (1) from the dividend after 17, then repeat: 171 / 86

Step 3:
The number 86 fits into 171 1 times, leaving a remainder of 85.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 86 from 171, we get 85.
Grab the next digit (3) from the dividend, add it to 85, then carry on: 853 / 86

Let's proceed to step 4:
If we divide 853 by 86, we get 9 and a remainder of 79.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
Subtract 774 from 853 to get 79.
Fetch the next digit (8) from the dividend, attach it to 79 and continue: 798 / 86

Moving on to step 5:
86 goes into 798 9 times with a remainder of 24.
Put 9 as the next digit of the answer. 
Result so far: 199.0
Subtracting 774 from 798 leaves us with 24.
Append the next digit (5) from the dividend to 24 and continue with: 245 / 86

Moving on to step 6:
The number 86 fits into 245 2 times, leaving a remainder of 73.
The next digit of our result is 2. 
Result so far: 1992.0
Subtract 172 from 245 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 7:
86 goes into 730 8 times with a remainder of 42.
Put 8 as the next digit of the answer. 
Result so far: 1992.8
The remainder is 42 after subtracting 688 from 730.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 8:
If we divide 420 by 86, we get 4 and a remainder of 76.
Write down 4 as next digit of the result. 
Result so far: 1992.84
Subtract 344 from 420 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 9:
86 can be fit into 760 8 times, resulting in a remainder of 72.
The next digit of our result is 8. 
Result so far: 1992.848
If we take 688 away from 760, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Let's proceed to step 10:
720 divided by 86 is 8 with a remainder of 32.
The next digit of our result is 8. 
Result so far: 1992.8488
Subtract 688 from 720 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

The final result is 1992.8488 with a remainder of 0.00032.