We're dividing 513120 by 25 
The aim is to understand the frequency of 25 in 513120.

Step 1:
If we divide 5 by 25, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 25

Going ahead to step 2:
25 can be fit into 51 2 times, resulting in a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 50 from 51, we get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 25

Going ahead to step 3:
13 divided by 25 is 0 with a remainder of 13.
The next digit of our result is 0. 
Result so far: 20.0
Subtracting 0 from 13 leaves us with 13.
Bring next digit (1) of the dividend behind the 13 and repeat the process: 131 / 25

Going ahead to step 4:
25 goes into 131 5 times with a remainder of 6.
Put 5 as the next digit of the answer. 
Result so far: 205.0
Subtracting 125 from 131 leaves us with 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 25

On to step 5:
25 goes into 62 2 times with a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 2052.0
Subtract 50 from 62 to get 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 25

Advancing to step 6:
25 goes into 120 4 times with a remainder of 20.
Record the quotient 4 as the next digit in the result. 
Result so far: 20524.0
The remainder is 20 after subtracting 100 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 7:
25 can be fit into 200 8 times, resulting in a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 20524.8
Deduct 200 from 200 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.

On to step 8:
The number 25 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 20524.8
Subtracting 0 from 0 leaves us 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.

On to step 9:
If we divide 0 by 25, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 20524.8
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.

Our division results in 20524.8 with a remaining 0.0.