We look at the division of 8091539 by 525 
The aim is to understand the frequency of 525 in 8091539.

Let's proceed to step 1:
8 divided by 525 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 525

Moving on to step 2:
80 divided by 525 is 0 with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Include the next digit (9) from the dividend after 80, then repeat: 809 / 525

Step 3:
809 divided by 525 is 1 with a remainder of 284.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 525 from 809 leaves us with 284.
Grab the next digit (1) from the dividend, add it to 284, then carry on: 2841 / 525

Going ahead to step 4:
525 goes into 2841 5 times with a remainder of 216.
Use 5 as the next digit of our solution. 
Result so far: 15.0
Deduct 2625 from 2841 and we're left with 216.
Include the next digit (5) from the dividend after 216, then repeat: 2165 / 525

Advancing to step 5:
525 can be fit into 2165 4 times, resulting in a remainder of 65.
The next digit of our result is 4. 
Result so far: 154.0
Subtracting 2100 from 2165 leaves us with 65.
Append the next digit (3) from the dividend to 65 and continue with: 653 / 525

Going ahead to step 6:
525 can be fit into 653 1 times, resulting in a remainder of 128.
Write down 1 as next digit of the result. 
Result so far: 1541.0
Subtract 525 from 653 to get 128.
Take the next digit (9) from the dividend and append it to 128, then repeat: 1289 / 525

Advancing to step 7:
When dividing 1289 by 525, we get 2 with a remainder of 239.
Put 2 as the next digit of the answer. 
Result so far: 15412.0
If we subtract 1050 from 1289, we get 239.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2390, and continue the process.

Advancing to step 8:
2390 divided by 525 is 4 with a remainder of 290.
The next digit of our result is 4. 
Result so far: 15412.4
Subtracting 2100 from 2390 leaves us with 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Advancing to step 9:
2900 divided by 525 is 5 with a remainder of 275.
Record the quotient 5 as the next digit in the result. 
Result so far: 15412.45
Subtracting 2625 from 2900 leaves us with 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Advancing to step 10:
When dividing 2750 by 525, we get 5 with a remainder of 125.
The next digit of our result is 5. 
Result so far: 15412.455
Deduct 2625 from 2750 and we're left with 125.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Our division results in 15412.455 with a remaining 0.0125.