72934209 divided by 525 
The aim is to understand the frequency of 525 in 72934209.

Step 1:
7 divided by 525 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 525

On to step 2:
525 can be fit into 72 0 times, resulting in a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 72 to get 72.
Append the next digit (9) from the dividend to 72 and continue with: 729 / 525

On to step 3:
If we divide 729 by 525, we get 1 and a remainder of 204.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 204 after subtracting 525 from 729.
Append the next digit (3) from the dividend to 204 and continue with: 2043 / 525

Advancing to step 4:
The number 525 fits into 2043 3 times, leaving a remainder of 468.
Write down 3 as next digit of the result. 
Result so far: 13.0
Subtracting 1575 from 2043 leaves us with 468.
Grab the next digit (4) from the dividend, add it to 468, then carry on: 4684 / 525

Advancing to step 5:
4684 divided by 525 is 8 with a remainder of 484.
The next digit of our result is 8. 
Result so far: 138.0
Subtracting 4200 from 4684 leaves us with 484.
Append the next digit (2) from the dividend to 484 and continue with: 4842 / 525

On to step 6:
When dividing 4842 by 525, we get 9 with a remainder of 117.
The next digit of our result is 9. 
Result so far: 1389.0
Subtracting 4725 from 4842 leaves us with 117.
Take the next digit (0) from the dividend and append it to 117, then repeat: 1170 / 525

Step 7:
When dividing 1170 by 525, we get 2 with a remainder of 120.
Put 2 as the next digit of the answer. 
Result so far: 13892.0
Subtract 1050 from 1170 to get 120.
Bring next digit (9) of the dividend behind the 120 and repeat the process: 1209 / 525

On to step 8:
The number 525 fits into 1209 2 times, leaving a remainder of 159.
The next digit of our result is 2. 
Result so far: 138922.0
Subtracting 1050 from 1209 leaves us with 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Step 9:
1590 divided by 525 is 3 with a remainder of 15.
Record the quotient 3 as the next digit in the result. 
Result so far: 138922.3
Subtracting 1575 from 1590 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 10:
150 divided by 525 is 0 with a remainder of 150.
Put 0 as the next digit of the answer. 
Result so far: 138922.3
If we subtract 0 from 150, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 11:
The number 525 fits into 1500 2 times, leaving a remainder of 450.
Write down 2 as next digit of the result. 
Result so far: 138922.302
If we subtract 1050 from 1500, we get 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Step 12:
525 goes into 4500 8 times with a remainder of 300.
Record the quotient 8 as the next digit in the result. 
Result so far: 138922.3028
The remainder is 300 after subtracting 4200 from 4500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

On to step 13:
525 goes into 3000 5 times with a remainder of 375.
The next digit of our result is 5. 
Result so far: 138922.30285
If we take 2625 away from 3000, we end up with 375.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3750, and continue the process.

Going ahead to step 14:
525 can be fit into 3750 7 times, resulting in a remainder of 75.
The next digit of our result is 7. 
Result so far: 138922.302857
Subtracting 3675 from 3750 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 15:
525 goes into 750 1 times with a remainder of 225.
The number 1 becomes the next digit in our result. 
Result so far: 138922.3028571
If we subtract 525 from 750, we get 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Let's proceed to step 16:
2250 divided by 525 is 4 with a remainder of 150.
The next digit of our result is 4. 
Result so far: 138922.30285714
If we subtract 2100 from 2250, we get 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

The final result is 138922.30285714 with a remainder of 1.5e-07.