91219547 ÷ 525 
The aim is to understand the frequency of 525 in 91219547.

Step 1:
If we divide 9 by 525, we get 0 and a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 525

On to step 2:
91 divided by 525 is 0 with a remainder of 91.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 91, we get 91.
Include the next digit (2) from the dividend after 91, then repeat: 912 / 525

Moving on to step 3:
525 goes into 912 1 times with a remainder of 387.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 387 after subtracting 525 from 912.
Bring next digit (1) of the dividend behind the 387 and repeat the process: 3871 / 525

Advancing to step 4:
525 can be fit into 3871 7 times, resulting in a remainder of 196.
The next digit of our result is 7. 
Result so far: 17.0
Subtracting 3675 from 3871 leaves us with 196.
Fetch the next digit (9) from the dividend, attach it to 196 and continue: 1969 / 525

Let's proceed to step 5:
When dividing 1969 by 525, we get 3 with a remainder of 394.
Use 3 as the next digit of our solution. 
Result so far: 173.0
Subtracting 1575 from 1969 leaves us with 394.
Grab the next digit (5) from the dividend, add it to 394, then carry on: 3945 / 525

On to step 6:
If we divide 3945 by 525, we get 7 and a remainder of 270.
The number 7 becomes the next digit in our result. 
Result so far: 1737.0
If we subtract 3675 from 3945, we get 270.
Fetch the next digit (4) from the dividend, attach it to 270 and continue: 2704 / 525

Advancing to step 7:
When dividing 2704 by 525, we get 5 with a remainder of 79.
Record the quotient 5 as the next digit in the result. 
Result so far: 17375.0
If we take 2625 away from 2704, we end up with 79.
Fetch the next digit (7) from the dividend, attach it to 79 and continue: 797 / 525

On to step 8:
797 divided by 525 is 1 with a remainder of 272.
The number 1 becomes the next digit in our result. 
Result so far: 173751.0
If we subtract 525 from 797, we get 272.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2720, and continue the process.

Advancing to step 9:
2720 divided by 525 is 5 with a remainder of 95.
Record the quotient 5 as the next digit in the result. 
Result so far: 173751.5
If we take 2625 away from 2720, we end up with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

On to step 10:
525 can be fit into 950 1 times, resulting in a remainder of 425.
The next digit of our result is 1. 
Result so far: 173751.51
Subtract 525 from 950 to get 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

Going ahead to step 11:
The number 525 fits into 4250 8 times, leaving a remainder of 50.
Write down 8 as next digit of the result. 
Result so far: 173751.518
If we take 4200 away from 4250, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 12:
The number 525 fits into 500 0 times, leaving a remainder of 500.
Use 0 as the next digit of our solution. 
Result so far: 173751.518
Subtract 0 from 500 to get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Step 13:
When dividing 5000 by 525, we get 9 with a remainder of 275.
Record the quotient 9 as the next digit in the result. 
Result so far: 173751.51809
If we subtract 4725 from 5000, we get 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Going ahead to step 14:
525 can be fit into 2750 5 times, resulting in a remainder of 125.
The number 5 becomes the next digit in our result. 
Result so far: 173751.518095
If we take 2625 away from 2750, we end up 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.

Moving on to step 15:
When dividing 1250 by 525, we get 2 with a remainder of 200.
Record the quotient 2 as the next digit in the result. 
Result so far: 173751.5180952
If we subtract 1050 from 1250, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

On to step 16:
525 can be fit into 2000 3 times, resulting in a remainder of 425.
The number 3 becomes the next digit in our result. 
Result so far: 173751.51809523
If we subtract 1575 from 2000, we get 425.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4250, and continue the process.

The quotient of the division is 173751.51809523, and the remainder is 4.25e-07.