We look at the division of 51857 by 52 
The aim is to understand the frequency of 52 in 51857.

Going ahead to step 1:
The number 52 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.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 52

Step 2:
If we divide 51 by 52, we get 0 and a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 51 to get 51.
Include the next digit (8) from the dividend after 51, then repeat: 518 / 52

Going ahead to step 3:
52 goes into 518 9 times with a remainder of 50.
Write down 9 as next digit of the result. 
Result so far: 9.0
Deduct 468 from 518 and we're left with 50.
Bring next digit (5) of the dividend behind the 50 and repeat the process: 505 / 52

Moving on to step 4:
When dividing 505 by 52, we get 9 with a remainder of 37.
Record the quotient 9 as the next digit in the result. 
Result so far: 99.0
Deduct 468 from 505 and we're left with 37.
Include the next digit (7) from the dividend after 37, then repeat: 377 / 52

On to step 5:
If we divide 377 by 52, we get 7 and a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 997.0
If we subtract 364 from 377, 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.

Advancing to step 6:
130 divided by 52 is 2 with a remainder of 26.
The next digit of our result is 2. 
Result so far: 997.2
Subtract 104 from 130 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Going ahead to step 7:
52 can be fit into 260 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 997.25
The remainder is 0 after subtracting 260 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
52 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 997.25
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
If we divide 0 by 52, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 997.25
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 997.25 and a remainder of 0.0.