428561 divided by 39 
The aim is to understand the frequency of 39 in 428561.

Moving on to step 1:
39 goes into 4 0 times with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 39

Step 2:
If we divide 42 by 39, we get 1 and a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 39 away from 42, we end up with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 39

Advancing to step 3:
The number 39 fits into 38 0 times, leaving a remainder of 38.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtracting 0 from 38 leaves us with 38.
Include the next digit (5) from the dividend after 38, then repeat: 385 / 39

Step 4:
385 divided by 39 is 9 with a remainder of 34.
Write down 9 as next digit of the result. 
Result so far: 109.0
Subtract 351 from 385 to get 34.
Append the next digit (6) from the dividend to 34 and continue with: 346 / 39

Step 5:
39 goes into 346 8 times with a remainder of 34.
The next digit of our result is 8. 
Result so far: 1098.0
If we subtract 312 from 346, we get 34.
Bring next digit (1) of the dividend behind the 34 and repeat the process: 341 / 39

Going ahead to step 6:
39 goes into 341 8 times with a remainder of 29.
Write down 8 as next digit of the result. 
Result so far: 10988.0
Deduct 312 from 341 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 7:
39 can be fit into 290 7 times, resulting in a remainder of 17.
The next digit of our result is 7. 
Result so far: 10988.7
Deduct 273 from 290 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 8:
39 can be fit into 170 4 times, resulting in a remainder of 14.
The next digit of our result is 4. 
Result so far: 10988.74
If we take 156 away from 170, we end up 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.

Advancing to step 9:
When dividing 140 by 39, we get 3 with a remainder of 23.
Write down 3 as next digit of the result. 
Result so far: 10988.743
Subtract 117 from 140 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 10:
When dividing 230 by 39, we get 5 with a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 10988.7435
Deduct 195 from 230 and we're left 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.

Going ahead to step 11:
39 goes into 350 8 times with a remainder of 38.
Put 8 as the next digit of the answer. 
Result so far: 10988.74358
Deduct 312 from 350 and we're left 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 12:
The number 39 fits into 380 9 times, leaving a remainder of 29.
The number 9 becomes the next digit in our result. 
Result so far: 10988.743589
If we take 351 away from 380, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 13:
290 divided by 39 is 7 with a remainder of 17.
The next digit of our result is 7. 
Result so far: 10988.7435897
Deduct 273 from 290 and we're left with 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 14:
The number 39 fits into 170 4 times, leaving a remainder of 14.
The next digit of our result is 4. 
Result so far: 10988.74358974
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.

Our division results in 10988.74358974 with a remaining 1.4e-08.