815654 ÷ 39 
The aim is to understand the frequency of 39 in 815654.

Step 1:
When dividing 8 by 39, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 39

Going ahead to step 2:
39 can be fit into 81 2 times, resulting in a remainder of 3.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we take 78 away from 81, we end up with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 39

Step 3:
35 divided by 39 is 0 with a remainder of 35.
The number 0 becomes the next digit in our result. 
Result so far: 20.0
Subtracting 0 from 35 leaves us with 35.
Bring next digit (6) of the dividend behind the 35 and repeat the process: 356 / 39

Moving on to step 4:
39 can be fit into 356 9 times, resulting in a remainder of 5.
Write down 9 as next digit of the result. 
Result so far: 209.0
If we take 351 away from 356, we end up with 5.
Fetch the next digit (5) from the dividend, attach it to 5 and continue: 55 / 39

Let's proceed to step 5:
39 goes into 55 1 times with a remainder of 16.
Put 1 as the next digit of the answer. 
Result so far: 2091.0
If we subtract 39 from 55, we get 16.
Include the next digit (4) from the dividend after 16, then repeat: 164 / 39

Step 6:
39 goes into 164 4 times with a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 20914.0
Subtracting 156 from 164 leaves us with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 7:
80 divided by 39 is 2 with a remainder of 2.
Record the quotient 2 as the next digit in the result. 
Result so far: 20914.2
If we take 78 away from 80, we end up 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.

Going ahead to step 8:
When dividing 20 by 39, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 20914.2
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
200 divided by 39 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 20914.205
If we subtract 195 from 200, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 10:
39 can be fit into 50 1 times, resulting in a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 20914.2051
Subtract 39 from 50 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 11:
The number 39 fits into 110 2 times, leaving a remainder of 32.
The number 2 becomes the next digit in our result. 
Result so far: 20914.20512
Deduct 78 from 110 and we're left with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 12:
If we divide 320 by 39, we get 8 and a remainder of 8.
Put 8 as the next digit of the answer. 
Result so far: 20914.205128
Deduct 312 from 320 and we're left with 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 13:
39 goes into 80 2 times with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 20914.2051282
If we take 78 away from 80, we end up 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.

Step 14:
39 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 20914.2051282
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

After the division, we end up with 20914.2051282 and a remainder of 2e-08.