We look at the division of 800863 by 39 
The aim is to understand the frequency of 39 in 800863.

Step 1:
8 divided by 39 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 39

On to step 2:
When dividing 80 by 39, we get 2 with a remainder of 2.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtracting 78 from 80 leaves us with 2.
Fetch the next digit (0) from the dividend, attach it to 2 and continue: 20 / 39

Let's proceed to step 3:
If we divide 20 by 39, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 20.0
Subtracting 0 from 20 leaves us with 20.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 39

Let's proceed to step 4:
39 goes into 208 5 times with a remainder of 13.
Write down 5 as next digit of the result. 
Result so far: 205.0
If we take 195 away from 208, we end up with 13.
Bring next digit (6) of the dividend behind the 13 and repeat the process: 136 / 39

On to step 5:
When dividing 136 by 39, we get 3 with a remainder of 19.
Write down 3 as next digit of the result. 
Result so far: 2053.0
The remainder is 19 after subtracting 117 from 136.
Take the next digit (3) from the dividend and append it to 19, then repeat: 193 / 39

Step 6:
When dividing 193 by 39, we get 4 with a remainder of 37.
Put 4 as the next digit of the answer. 
Result so far: 20534.0
Subtract 156 from 193 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 7:
370 divided by 39 is 9 with a remainder of 19.
Write down 9 as next digit of the result. 
Result so far: 20534.9
Subtract 351 from 370 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 8:
190 divided by 39 is 4 with a remainder of 34.
Write down 4 as next digit of the result. 
Result so far: 20534.94
Deduct 156 from 190 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Going ahead to step 9:
39 goes into 340 8 times with a remainder of 28.
The number 8 becomes the next digit in our result. 
Result so far: 20534.948
If we subtract 312 from 340, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 10:
39 can be fit into 280 7 times, resulting in a remainder of 7.
Use 7 as the next digit of our solution. 
Result so far: 20534.9487
Deduct 273 from 280 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

On to step 11:
The number 39 fits into 70 1 times, leaving a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 20534.94871
Subtract 39 from 70 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Moving on to step 12:
If we divide 310 by 39, we get 7 and a remainder of 37.
Use 7 as the next digit of our solution. 
Result so far: 20534.948717
Deduct 273 from 310 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 13:
370 divided by 39 is 9 with a remainder of 19.
Write down 9 as next digit of the result. 
Result so far: 20534.9487179
If we subtract 351 from 370, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
190 divided by 39 is 4 with a remainder of 34.
Write down 4 as next digit of the result. 
Result so far: 20534.94871794
Subtract 156 from 190 to get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The final outcome is 20534.94871794, with a leftover of 3.4e-08.