We look at the division of 77664081 by 525 
The aim is to understand the frequency of 525 in 77664081.

Step 1:
The number 525 fits into 7 0 times, leaving a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 525

Going ahead to step 2:
525 can be fit into 77 0 times, resulting in a remainder of 77.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 77 and we're left with 77.
Fetch the next digit (6) from the dividend, attach it to 77 and continue: 776 / 525

Moving on to step 3:
776 divided by 525 is 1 with a remainder of 251.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we subtract 525 from 776, we get 251.
Take the next digit (6) from the dividend and append it to 251, then repeat: 2516 / 525

Advancing to step 4:
2516 divided by 525 is 4 with a remainder of 416.
The next digit of our result is 4. 
Result so far: 14.0
Deduct 2100 from 2516 and we're left with 416.
Take the next digit (4) from the dividend and append it to 416, then repeat: 4164 / 525

Advancing to step 5:
525 can be fit into 4164 7 times, resulting in a remainder of 489.
The next digit of our result is 7. 
Result so far: 147.0
Deduct 3675 from 4164 and we're left with 489.
Grab the next digit (0) from the dividend, add it to 489, then carry on: 4890 / 525

Step 6:
The number 525 fits into 4890 9 times, leaving a remainder of 165.
Record the quotient 9 as the next digit in the result. 
Result so far: 1479.0
Subtracting 4725 from 4890 leaves us with 165.
Include the next digit (8) from the dividend after 165, then repeat: 1658 / 525

On to step 7:
The number 525 fits into 1658 3 times, leaving a remainder of 83.
The number 3 becomes the next digit in our result. 
Result so far: 14793.0
Subtract 1575 from 1658 to get 83.
Bring next digit (1) of the dividend behind the 83 and repeat the process: 831 / 525

On to step 8:
The number 525 fits into 831 1 times, leaving a remainder of 306.
Write down 1 as next digit of the result. 
Result so far: 147931.0
If we subtract 525 from 831, we get 306.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

Advancing to step 9:
When dividing 3060 by 525, we get 5 with a remainder of 435.
The next digit of our result is 5. 
Result so far: 147931.5
Subtracting 2625 from 3060 leaves us with 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

Advancing to step 10:
4350 divided by 525 is 8 with a remainder of 150.
The number 8 becomes the next digit in our result. 
Result so far: 147931.58
Subtract 4200 from 4350 to 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.

On to step 11:
1500 divided by 525 is 2 with a remainder of 450.
Put 2 as the next digit of the answer. 
Result so far: 147931.582
Subtract 1050 from 1500 to 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.

Advancing to step 12:
The number 525 fits into 4500 8 times, leaving a remainder of 300.
Use 8 as the next digit of our solution. 
Result so far: 147931.5828
Deduct 4200 from 4500 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 13:
525 can be fit into 3000 5 times, resulting in a remainder of 375.
Record the quotient 5 as the next digit in the result. 
Result so far: 147931.58285
The remainder is 375 after subtracting 2625 from 3000.
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.
Write down 7 as next digit of the result. 
Result so far: 147931.582857
If we subtract 3675 from 3750, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Moving on to step 15:
When dividing 750 by 525, we get 1 with a remainder of 225.
The next digit of our result is 1. 
Result so far: 147931.5828571
Subtracting 525 from 750 leaves us with 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.
Write down 4 as next digit of the result. 
Result so far: 147931.58285714
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.

Our division results in 147931.58285714 with a remaining 1.5e-07.