We look at the division of 87855316 by 525 
The aim is to understand the frequency of 525 in 87855316.

Going ahead to step 1:
If we divide 8 by 525, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 525

Step 2:
When dividing 87 by 525, we get 0 with a remainder of 87.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 87 after subtracting 0 from 87.
Include the next digit (8) from the dividend after 87, then repeat: 878 / 525

Going ahead to step 3:
The number 525 fits into 878 1 times, leaving a remainder of 353.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 525 from 878 to get 353.
Bring next digit (5) of the dividend behind the 353 and repeat the process: 3535 / 525

Advancing to step 4:
The number 525 fits into 3535 6 times, leaving a remainder of 385.
The next digit of our result is 6. 
Result so far: 16.0
Deduct 3150 from 3535 and we're left with 385.
Grab the next digit (5) from the dividend, add it to 385, then carry on: 3855 / 525

Advancing to step 5:
The number 525 fits into 3855 7 times, leaving a remainder of 180.
Write down 7 as next digit of the result. 
Result so far: 167.0
Subtracting 3675 from 3855 leaves us with 180.
Take the next digit (3) from the dividend and append it to 180, then repeat: 1803 / 525

Going ahead to step 6:
When dividing 1803 by 525, we get 3 with a remainder of 228.
Use 3 as the next digit of our solution. 
Result so far: 1673.0
If we subtract 1575 from 1803, we get 228.
Take the next digit (1) from the dividend and append it to 228, then repeat: 2281 / 525

On to step 7:
525 can be fit into 2281 4 times, resulting in a remainder of 181.
The number 4 becomes the next digit in our result. 
Result so far: 16734.0
If we subtract 2100 from 2281, we get 181.
Include the next digit (6) from the dividend after 181, then repeat: 1816 / 525

Let's proceed to step 8:
525 can be fit into 1816 3 times, resulting in a remainder of 241.
The next digit of our result is 3. 
Result so far: 167343.0
The remainder is 241 after subtracting 1575 from 1816.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Step 9:
The number 525 fits into 2410 4 times, leaving a remainder of 310.
Put 4 as the next digit of the answer. 
Result so far: 167343.4
The remainder is 310 after subtracting 2100 from 2410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Moving on to step 10:
If we divide 3100 by 525, we get 5 and a remainder of 475.
Use 5 as the next digit of our solution. 
Result so far: 167343.45
Subtract 2625 from 3100 to get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Advancing to step 11:
When dividing 4750 by 525, we get 9 with a remainder of 25.
Write down 9 as next digit of the result. 
Result so far: 167343.459
Subtract 4725 from 4750 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 12:
When dividing 250 by 525, we get 0 with a remainder of 250.
Write down 0 as next digit of the result. 
Result so far: 167343.459
Deduct 0 from 250 and we're left with 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

On to step 13:
When dividing 2500 by 525, we get 4 with a remainder of 400.
Put 4 as the next digit of the answer. 
Result so far: 167343.45904
If we subtract 2100 from 2500, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Advancing to step 14:
4000 divided by 525 is 7 with a remainder of 325.
The next digit of our result is 7. 
Result so far: 167343.459047
Subtract 3675 from 4000 to get 325.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3250, and continue the process.

On to step 15:
The number 525 fits into 3250 6 times, leaving a remainder of 100.
Put 6 as the next digit of the answer. 
Result so far: 167343.4590476
Subtracting 3150 from 3250 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 16:
1000 divided by 525 is 1 with a remainder of 475.
Write down 1 as next digit of the result. 
Result so far: 167343.45904761
Subtract 525 from 1000 to get 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

After the division, we end up with 167343.45904761 and a remainder of 4.75e-07.