We look at the division of 203623 by 86 
The aim is to understand the frequency of 86 in 203623.

On to step 1:
When dividing 2 by 86, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 86

Step 2:
86 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 20, we get 20.
Bring next digit (3) of the dividend behind the 20 and repeat the process: 203 / 86

Step 3:
86 goes into 203 2 times with a remainder of 31.
Write down 2 as next digit of the result. 
Result so far: 2.0
If we take 172 away from 203, we end up with 31.
Take the next digit (6) from the dividend and append it to 31, then repeat: 316 / 86

Advancing to step 4:
The number 86 fits into 316 3 times, leaving a remainder of 58.
Write down 3 as next digit of the result. 
Result so far: 23.0
Deduct 258 from 316 and we're left with 58.
Take the next digit (2) from the dividend and append it to 58, then repeat: 582 / 86

Let's proceed to step 5:
If we divide 582 by 86, we get 6 and a remainder of 66.
Record the quotient 6 as the next digit in the result. 
Result so far: 236.0
If we take 516 away from 582, we end up with 66.
Take the next digit (3) from the dividend and append it to 66, then repeat: 663 / 86

On to step 6:
663 divided by 86 is 7 with a remainder of 61.
Use 7 as the next digit of our solution. 
Result so far: 2367.0
Deduct 602 from 663 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Advancing to step 7:
86 can be fit into 610 7 times, resulting in a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 2367.7
Subtract 602 from 610 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 8:
86 goes into 80 0 times with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 2367.7
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 9:
86 can be fit into 800 9 times, resulting in a remainder of 26.
The number 9 becomes the next digit in our result. 
Result so far: 2367.709
Subtract 774 from 800 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 10:
86 can be fit into 260 3 times, resulting in a remainder of 2.
The next digit of our result is 3. 
Result so far: 2367.7093
Subtracting 258 from 260 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 11:
When dividing 20 by 86, we get 0 with a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 2367.7093
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 12:
86 can be fit into 200 2 times, resulting in a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 2367.709302
If we take 172 away from 200, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 13:
86 can be fit into 280 3 times, resulting in a remainder of 22.
The number 3 becomes the next digit in our result. 
Result so far: 2367.7093023
The remainder is 22 after subtracting 258 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 14:
The number 86 fits into 220 2 times, leaving a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 2367.70930232
If we take 172 away from 220, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

The final outcome is 2367.70930232, with a leftover of 4.8e-08.