831255 ÷ 39 
The aim is to understand the frequency of 39 in 831255.

Let's proceed to step 1:
When dividing 8 by 39, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 39

Moving on to step 2:
If we divide 83 by 39, we get 2 and a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 78 from 83, we get 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 39

Let's proceed to step 3:
39 can be fit into 51 1 times, resulting in a remainder of 12.
The next digit of our result is 1. 
Result so far: 21.0
The remainder is 12 after subtracting 39 from 51.
Include the next digit (2) from the dividend after 12, then repeat: 122 / 39

Moving on to step 4:
122 divided by 39 is 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 213.0
If we subtract 117 from 122, we get 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 39

Moving on to step 5:
The number 39 fits into 55 1 times, leaving a remainder of 16.
The number 1 becomes the next digit in our result. 
Result so far: 2131.0
The remainder is 16 after subtracting 39 from 55.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 39

Advancing to step 6:
If we divide 165 by 39, we get 4 and a remainder of 9.
The next digit of our result is 4. 
Result so far: 21314.0
Subtract 156 from 165 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 7:
When dividing 90 by 39, we get 2 with a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 21314.2
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 8:
The number 39 fits into 120 3 times, leaving a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 21314.23
Deduct 117 from 120 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
39 can be fit into 30 0 times, resulting in a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 21314.23
The remainder is 30 after subtracting 0 from 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 10:
If we divide 300 by 39, we get 7 and a remainder of 27.
Put 7 as the next digit of the answer. 
Result so far: 21314.2307
The remainder is 27 after subtracting 273 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Going ahead to step 11:
The number 39 fits into 270 6 times, leaving a remainder of 36.
Record the quotient 6 as the next digit in the result. 
Result so far: 21314.23076
Deduct 234 from 270 and we're left 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 12:
39 goes into 360 9 times with a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 21314.230769
If we subtract 351 from 360, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 13:
39 can be fit into 90 2 times, resulting in a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 21314.2307692
If we subtract 78 from 90, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 14:
The number 39 fits into 120 3 times, leaving a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 21314.23076923
Subtracting 117 from 120 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 21314.23076923, with a leftover of 3e-09.