Let's divide 865439 by 86
The aim is to understand the frequency of 86 in 865439.

On to step 1:
86 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 86

On to step 2:
86 goes into 86 1 times with a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 86 from 86 and we're left with 0.
Grab the next digit (5) from the dividend, add it to 0, then carry on: 5 / 86

Moving on to step 3:
When dividing 5 by 86, we get 0 with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
If we take 0 away from 5, we end up with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 86

Let's proceed to step 4:
If we divide 54 by 86, we get 0 and a remainder of 54.
The number 0 becomes the next digit in our result. 
Result so far: 100.0
Subtract 0 from 54 to get 54.
Take the next digit (3) from the dividend and append it to 54, then repeat: 543 / 86

Advancing to step 5:
When dividing 543 by 86, we get 6 with a remainder of 27.
The next digit of our result is 6. 
Result so far: 1006.0
Subtract 516 from 543 to get 27.
Append the next digit (9) from the dividend to 27 and continue with: 279 / 86

Advancing to step 6:
86 can be fit into 279 3 times, resulting in a remainder of 21.
Use 3 as the next digit of our solution. 
Result so far: 10063.0
The remainder is 21 after subtracting 258 from 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
210 divided by 86 is 2 with a remainder of 38.
The next digit of our result is 2. 
Result so far: 10063.2
Deduct 172 from 210 and we're left 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.

Advancing to step 8:
If we divide 380 by 86, we get 4 and a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 10063.24
Subtracting 344 from 380 leaves us 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.

Let's proceed to step 9:
The number 86 fits into 360 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 10063.244
If we take 344 away from 360, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final result is 10063.244 with a remainder of 0.0016.