We look at the division of 57391 by 71 
The aim is to understand the frequency of 71 in 57391.

Let's proceed to step 1:
The number 71 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 71

On to step 2:
71 can be fit into 57 0 times, resulting in a remainder of 57.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 57, we get 57.
Fetch the next digit (3) from the dividend, attach it to 57 and continue: 573 / 71

Let's proceed to step 3:
When dividing 573 by 71, we get 8 with a remainder of 5.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 5 after subtracting 568 from 573.
Bring next digit (9) of the dividend behind the 5 and repeat the process: 59 / 71

Going ahead to step 4:
If we divide 59 by 71, we get 0 and a remainder of 59.
Put 0 as the next digit of the answer. 
Result so far: 80.0
If we take 0 away from 59, we end up with 59.
Bring next digit (1) of the dividend behind the 59 and repeat the process: 591 / 71

Moving on to step 5:
71 can be fit into 591 8 times, resulting in a remainder of 23.
Use 8 as the next digit of our solution. 
Result so far: 808.0
Subtracting 568 from 591 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 6:
If we divide 230 by 71, we get 3 and a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 808.3
Deduct 213 from 230 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.

Step 7:
If we divide 170 by 71, we get 2 and a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 808.32
Subtract 142 from 170 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 8:
71 goes into 280 3 times with a remainder of 67.
Record the quotient 3 as the next digit in the result. 
Result so far: 808.323
The remainder is 67 after subtracting 213 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 9:
If we divide 670 by 71, we get 9 and a remainder of 31.
The number 9 becomes the next digit in our result. 
Result so far: 808.3239
Subtract 639 from 670 to 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.

Going ahead to step 10:
71 can be fit into 310 4 times, resulting in a remainder of 26.
The next digit of our result is 4. 
Result so far: 808.32394
The remainder is 26 after subtracting 284 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 11:
71 goes into 260 3 times with a remainder of 47.
Write down 3 as next digit of the result. 
Result so far: 808.323943
The remainder is 47 after subtracting 213 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Advancing to step 12:
71 goes into 470 6 times with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 808.3239436
If we take 426 away from 470, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 13:
71 goes into 440 6 times with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 808.32394366
If we subtract 426 from 440, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final result is 808.32394366 with a remainder of 1.4e-08.