5209 divided by 57 
The aim is to understand the frequency of 57 in 5209.

Let's proceed to step 1:
When dividing 5 by 57, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 57

Moving on to step 2:
57 can be fit into 52 0 times, resulting in a remainder of 52.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Take the next digit (0) from the dividend and append it to 52, then repeat: 520 / 57

Going ahead to step 3:
520 divided by 57 is 9 with a remainder of 7.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 513 from 520, we get 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 57

Going ahead to step 4:
57 can be fit into 79 1 times, resulting in a remainder of 22.
Record the quotient 1 as the next digit in the result. 
Result so far: 91.0
If we take 57 away from 79, we end up 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.

Moving on to step 5:
When dividing 220 by 57, we get 3 with a remainder of 49.
The next digit of our result is 3. 
Result so far: 91.3
Subtracting 171 from 220 leaves us 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.

Step 6:
57 can be fit into 490 8 times, resulting in a remainder of 34.
Put 8 as the next digit of the answer. 
Result so far: 91.38
If we subtract 456 from 490, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 7:
The number 57 fits into 340 5 times, leaving a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 91.385
The remainder is 55 after subtracting 285 from 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 8:
The number 57 fits into 550 9 times, leaving a remainder of 37.
The next digit of our result is 9. 
Result so far: 91.3859
If we take 513 away from 550, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 9:
57 goes into 370 6 times with a remainder of 28.
The number 6 becomes the next digit in our result. 
Result so far: 91.38596
The remainder is 28 after subtracting 342 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 10:
57 goes into 280 4 times with a remainder of 52.
The next digit of our result is 4. 
Result so far: 91.385964
If we take 228 away from 280, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Moving on to step 11:
57 can be fit into 520 9 times, resulting in a remainder of 7.
Use 9 as the next digit of our solution. 
Result so far: 91.3859649
The remainder is 7 after subtracting 513 from 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 12:
If we divide 70 by 57, we get 1 and a remainder of 13.
The next digit of our result is 1. 
Result so far: 91.38596491
If we subtract 57 from 70, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final result is 91.38596491 with a remainder of 1.3e-08.