We're dividing 53425987 by 439 
The aim is to understand the frequency of 439 in 53425987.

Let's proceed to step 1:
When dividing 5 by 439, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 439

Advancing to step 2:
When dividing 53 by 439, we get 0 with a remainder of 53.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Take the next digit (4) from the dividend and append it to 53, then repeat: 534 / 439

Going ahead to step 3:
439 goes into 534 1 times with a remainder of 95.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 95 after subtracting 439 from 534.
Append the next digit (2) from the dividend to 95 and continue with: 952 / 439

On to step 4:
439 goes into 952 2 times with a remainder of 74.
The next digit of our result is 2. 
Result so far: 12.0
If we take 878 away from 952, we end up with 74.
Fetch the next digit (5) from the dividend, attach it to 74 and continue: 745 / 439

On to step 5:
The number 439 fits into 745 1 times, leaving a remainder of 306.
Put 1 as the next digit of the answer. 
Result so far: 121.0
Subtracting 439 from 745 leaves us with 306.
Include the next digit (9) from the dividend after 306, then repeat: 3069 / 439

Going ahead to step 6:
If we divide 3069 by 439, we get 6 and a remainder of 435.
The number 6 becomes the next digit in our result. 
Result so far: 1216.0
If we take 2634 away from 3069, we end up with 435.
Bring next digit (8) of the dividend behind the 435 and repeat the process: 4358 / 439

Going ahead to step 7:
4358 divided by 439 is 9 with a remainder of 407.
The number 9 becomes the next digit in our result. 
Result so far: 12169.0
Deduct 3951 from 4358 and we're left with 407.
Fetch the next digit (7) from the dividend, attach it to 407 and continue: 4077 / 439

Step 8:
439 can be fit into 4077 9 times, resulting in a remainder of 126.
Write down 9 as next digit of the result. 
Result so far: 121699.0
Deduct 3951 from 4077 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

On to step 9:
439 goes into 1260 2 times with a remainder of 382.
The next digit of our result is 2. 
Result so far: 121699.2
The remainder is 382 after subtracting 878 from 1260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

Going ahead to step 10:
The number 439 fits into 3820 8 times, leaving a remainder of 308.
The number 8 becomes the next digit in our result. 
Result so far: 121699.28
If we subtract 3512 from 3820, we get 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

Going ahead to step 11:
The number 439 fits into 3080 7 times, leaving a remainder of 7.
Record the quotient 7 as the next digit in the result. 
Result so far: 121699.287
Deduct 3073 from 3080 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.

Moving on to step 12:
If we divide 70 by 439, we get 0 and a remainder of 70.
Use 0 as the next digit of our solution. 
Result so far: 121699.287
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 13:
If we divide 700 by 439, we get 1 and a remainder of 261.
Use 1 as the next digit of our solution. 
Result so far: 121699.28701
Subtracting 439 from 700 leaves us with 261.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2610, and continue the process.

On to step 14:
If we divide 2610 by 439, we get 5 and a remainder of 415.
Record the quotient 5 as the next digit in the result. 
Result so far: 121699.287015
If we take 2195 away from 2610, we end up with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Step 15:
If we divide 4150 by 439, we get 9 and a remainder of 199.
The number 9 becomes the next digit in our result. 
Result so far: 121699.2870159
The remainder is 199 after subtracting 3951 from 4150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Step 16:
The number 439 fits into 1990 4 times, leaving a remainder of 234.
Put 4 as the next digit of the answer. 
Result so far: 121699.28701594
Subtracting 1756 from 1990 leaves us with 234.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2340, and continue the process.

The final result is 121699.28701594 with a remainder of 2.34e-07.