We look at the division of 439765 by 57 
The aim is to understand the frequency of 57 in 439765.

On to step 1:
When dividing 4 by 57, we get 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 57

Advancing to step 2:
If we divide 43 by 57, we get 0 and a remainder of 43.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 43, we end up with 43.
Include the next digit (9) from the dividend after 43, then repeat: 439 / 57

Going ahead to step 3:
57 can be fit into 439 7 times, resulting in a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtract 399 from 439 to get 40.
Bring next digit (7) of the dividend behind the 40 and repeat the process: 407 / 57

Going ahead to step 4:
When dividing 407 by 57, we get 7 with a remainder of 8.
The next digit of our result is 7. 
Result so far: 77.0
If we take 399 away from 407, we end up with 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 57

Advancing to step 5:
The number 57 fits into 86 1 times, leaving a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 771.0
If we subtract 57 from 86, we get 29.
Append the next digit (5) from the dividend to 29 and continue with: 295 / 57

Step 6:
57 can be fit into 295 5 times, resulting in a remainder of 10.
Use 5 as the next digit of our solution. 
Result so far: 7715.0
If we subtract 285 from 295, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
When dividing 100 by 57, we get 1 with a remainder of 43.
Put 1 as the next digit of the answer. 
Result so far: 7715.1
Subtracting 57 from 100 leaves us with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Going ahead to step 8:
If we divide 430 by 57, we get 7 and a remainder of 31.
The number 7 becomes the next digit in our result. 
Result so far: 7715.17
If we subtract 399 from 430, we get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 9:
The number 57 fits into 310 5 times, leaving a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 7715.175
Deduct 285 from 310 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 10:
The number 57 fits into 250 4 times, leaving a remainder of 22.
Write down 4 as next digit of the result. 
Result so far: 7715.1754
Deduct 228 from 250 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 11:
57 goes into 220 3 times with a remainder of 49.
The next digit of our result is 3. 
Result so far: 7715.17543
If we take 171 away from 220, we end up with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 12:
57 can be fit into 490 8 times, resulting in a remainder of 34.
Write down 8 as next digit of the result. 
Result so far: 7715.175438
Subtracting 456 from 490 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 13:
The number 57 fits into 340 5 times, leaving a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 7715.1754385
Deduct 285 from 340 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 14:
If we divide 550 by 57, we get 9 and a remainder of 37.
The next digit of our result is 9. 
Result so far: 7715.17543859
Subtract 513 from 550 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

After the division, we end up with 7715.17543859 and a remainder of 3.7e-08.