We look at the division of 689729 by 39 
The aim is to understand the frequency of 39 in 689729.

Step 1:
6 divided by 39 is 0 with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (8) from the dividend after 6, then repeat: 68 / 39

Advancing to step 2:
39 can be fit into 68 1 times, resulting in a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 39 from 68 to get 29.
Append the next digit (9) from the dividend to 29 and continue with: 299 / 39

Moving on to step 3:
When dividing 299 by 39, we get 7 with a remainder of 26.
Record the quotient 7 as the next digit in the result. 
Result so far: 17.0
Subtracting 273 from 299 leaves us with 26.
Grab the next digit (7) from the dividend, add it to 26, then carry on: 267 / 39

Step 4:
If we divide 267 by 39, we get 6 and a remainder of 33.
Put 6 as the next digit of the answer. 
Result so far: 176.0
If we take 234 away from 267, we end up with 33.
Include the next digit (2) from the dividend after 33, then repeat: 332 / 39

Advancing to step 5:
39 can be fit into 332 8 times, resulting in a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 1768.0
Deduct 312 from 332 and we're left with 20.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 39

On to step 6:
209 divided by 39 is 5 with a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 17685.0
Subtracting 195 from 209 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 7:
The number 39 fits into 140 3 times, leaving a remainder of 23.
The number 3 becomes the next digit in our result. 
Result so far: 17685.3
If we take 117 away from 140, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 8:
The number 39 fits into 230 5 times, leaving a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 17685.35
If we take 195 away from 230, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 9:
350 divided by 39 is 8 with a remainder of 38.
Use 8 as the next digit of our solution. 
Result so far: 17685.358
Subtracting 312 from 350 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 10:
When dividing 380 by 39, we get 9 with a remainder of 29.
Use 9 as the next digit of our solution. 
Result so far: 17685.3589
Subtract 351 from 380 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 11:
39 can be fit into 290 7 times, resulting in a remainder of 17.
Put 7 as the next digit of the answer. 
Result so far: 17685.35897
Subtract 273 from 290 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 12:
If we divide 170 by 39, we get 4 and a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 17685.358974
The remainder is 14 after subtracting 156 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 13:
If we divide 140 by 39, we get 3 and a remainder of 23.
The next digit of our result is 3. 
Result so far: 17685.3589743
Deduct 117 from 140 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 14:
39 can be fit into 230 5 times, resulting in a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 17685.35897435
Subtracting 195 from 230 leaves us with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final result is 17685.35897435 with a remainder of 3.5e-08.