80404893 divided by 525 
The aim is to understand the frequency of 525 in 80404893.

On to step 1:
When dividing 8 by 525, we get 0 with a remainder of 8.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 525

Going ahead to step 2:
525 goes into 80 0 times with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 80 to get 80.
Include the next digit (4) from the dividend after 80, then repeat: 804 / 525

Going ahead to step 3:
804 divided by 525 is 1 with a remainder of 279.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 525 from 804 and we're left with 279.
Include the next digit (0) from the dividend after 279, then repeat: 2790 / 525

Moving on to step 4:
525 can be fit into 2790 5 times, resulting in a remainder of 165.
Put 5 as the next digit of the answer. 
Result so far: 15.0
If we take 2625 away from 2790, we end up with 165.
Grab the next digit (4) from the dividend, add it to 165, then carry on: 1654 / 525

On to step 5:
When dividing 1654 by 525, we get 3 with a remainder of 79.
The number 3 becomes the next digit in our result. 
Result so far: 153.0
The remainder is 79 after subtracting 1575 from 1654.
Include the next digit (8) from the dividend after 79, then repeat: 798 / 525

On to step 6:
If we divide 798 by 525, we get 1 and a remainder of 273.
Record the quotient 1 as the next digit in the result. 
Result so far: 1531.0
If we take 525 away from 798, we end up with 273.
Append the next digit (9) from the dividend to 273 and continue with: 2739 / 525

Advancing to step 7:
The number 525 fits into 2739 5 times, leaving a remainder of 114.
Record the quotient 5 as the next digit in the result. 
Result so far: 15315.0
Subtract 2625 from 2739 to get 114.
Bring next digit (3) of the dividend behind the 114 and repeat the process: 1143 / 525

Moving on to step 8:
525 goes into 1143 2 times with a remainder of 93.
The number 2 becomes the next digit in our result. 
Result so far: 153152.0
The remainder is 93 after subtracting 1050 from 1143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 930, and continue the process.

Let's proceed to step 9:
When dividing 930 by 525, we get 1 with a remainder of 405.
The number 1 becomes the next digit in our result. 
Result so far: 153152.1
Subtract 525 from 930 to get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

Advancing to step 10:
If we divide 4050 by 525, we get 7 and a remainder of 375.
Put 7 as the next digit of the answer. 
Result so far: 153152.17
If we take 3675 away from 4050, 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 11:
525 goes into 3750 7 times with a remainder of 75.
Put 7 as the next digit of the answer. 
Result so far: 153152.177
If we take 3675 away from 3750, we end up 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.

The quotient of the division is 153152.177, and the remainder is 0.0075.