We're dividing 393258 by 57 
The aim is to understand the frequency of 57 in 393258.

Moving on to step 1:
3 divided by 57 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 57

Going ahead to step 2:
When dividing 39 by 57, we get 0 with a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Fetch the next digit (3) from the dividend, attach it to 39 and continue: 393 / 57

Let's proceed to step 3:
When dividing 393 by 57, we get 6 with a remainder of 51.
Use 6 as the next digit of our solution. 
Result so far: 6.0
If we take 342 away from 393, we end up with 51.
Fetch the next digit (2) from the dividend, attach it to 51 and continue: 512 / 57

Step 4:
The number 57 fits into 512 8 times, leaving a remainder of 56.
Write down 8 as next digit of the result. 
Result so far: 68.0
If we take 456 away from 512, we end up with 56.
Take the next digit (5) from the dividend and append it to 56, then repeat: 565 / 57

On to step 5:
When dividing 565 by 57, we get 9 with a remainder of 52.
Put 9 as the next digit of the answer. 
Result so far: 689.0
Deduct 513 from 565 and we're left with 52.
Include the next digit (8) from the dividend after 52, then repeat: 528 / 57

Step 6:
57 goes into 528 9 times with a remainder of 15.
Record the quotient 9 as the next digit in the result. 
Result so far: 6899.0
Subtract 513 from 528 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 7:
When dividing 150 by 57, we get 2 with a remainder of 36.
The next digit of our result is 2. 
Result so far: 6899.2
If we subtract 114 from 150, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Let's proceed to step 8:
57 can be fit into 360 6 times, resulting in a remainder of 18.
The next digit of our result is 6. 
Result so far: 6899.26
Subtracting 342 from 360 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 9:
The number 57 fits into 180 3 times, leaving a remainder of 9.
Write down 3 as next digit of the result. 
Result so far: 6899.263
If we take 171 away from 180, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 10:
When dividing 90 by 57, we get 1 with a remainder of 33.
The next digit of our result is 1. 
Result so far: 6899.2631
If we take 57 away from 90, we end up with 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Step 11:
330 divided by 57 is 5 with a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 6899.26315
Subtracting 285 from 330 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 12:
57 goes into 450 7 times with a remainder of 51.
Put 7 as the next digit of the answer. 
Result so far: 6899.263157
Subtract 399 from 450 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Advancing to step 13:
57 can be fit into 510 8 times, resulting in a remainder of 54.
The number 8 becomes the next digit in our result. 
Result so far: 6899.2631578
Deduct 456 from 510 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 14:
540 divided by 57 is 9 with a remainder of 27.
Use 9 as the next digit of our solution. 
Result so far: 6899.26315789
Subtracting 513 from 540 leaves us 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.

The final result is 6899.26315789 with a remainder of 2.7e-08.