Let's divide 102912 by 39
The aim is to understand the frequency of 39 in 102912.

Step 1:
When dividing 1 by 39, we get 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 39

Moving on to step 2:
If we divide 10 by 39, we get 0 and a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 10 after subtracting 0 from 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 39

Moving on to step 3:
39 can be fit into 102 2 times, resulting in a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 78 from 102 leaves us with 24.
Bring next digit (9) of the dividend behind the 24 and repeat the process: 249 / 39

On to step 4:
If we divide 249 by 39, we get 6 and a remainder of 15.
The next digit of our result is 6. 
Result so far: 26.0
The remainder is 15 after subtracting 234 from 249.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 39

Going ahead to step 5:
39 can be fit into 151 3 times, resulting in a remainder of 34.
Put 3 as the next digit of the answer. 
Result so far: 263.0
Deduct 117 from 151 and we're left with 34.
Include the next digit (2) from the dividend after 34, then repeat: 342 / 39

Going ahead to step 6:
39 can be fit into 342 8 times, resulting in a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 2638.0
Subtracting 312 from 342 leaves us with 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 7:
300 divided by 39 is 7 with a remainder of 27.
Write down 7 as next digit of the result. 
Result so far: 2638.7
If we take 273 away from 300, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 8:
If we divide 270 by 39, we get 6 and a remainder of 36.
Record the quotient 6 as the next digit in the result. 
Result so far: 2638.76
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.

On to step 9:
If we divide 360 by 39, we get 9 and a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 2638.769
Subtract 351 from 360 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.

Let's proceed to step 10:
If we divide 90 by 39, we get 2 and a remainder of 12.
Use 2 as the next digit of our solution. 
Result so far: 2638.7692
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.

Let's proceed to step 11:
If we divide 120 by 39, we get 3 and a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 2638.76923
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.

On to step 12:
30 divided by 39 is 0 with a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 2638.76923
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.

Step 13:
39 can be fit into 300 7 times, resulting in a remainder of 27.
Write down 7 as next digit of the result. 
Result so far: 2638.7692307
If we subtract 273 from 300, we get 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 14:
The number 39 fits into 270 6 times, leaving a remainder of 36.
The next digit of our result is 6. 
Result so far: 2638.76923076
If we take 234 away from 270, we end up 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.

In conclusion, the division gives 2638.76923076 with a balance of 3.6e-08.