Let's divide 8635549 by 810
The aim is to understand the frequency of 810 in 8635549.

On to step 1:
810 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 810

Let's proceed to step 2:
810 goes into 86 0 times with a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Append the next digit (3) from the dividend to 86 and continue with: 863 / 810

Step 3:
810 can be fit into 863 1 times, resulting in a remainder of 53.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 810 from 863 to get 53.
Append the next digit (5) from the dividend to 53 and continue with: 535 / 810

Moving on to step 4:
535 divided by 810 is 0 with a remainder of 535.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtracting 0 from 535 leaves us with 535.
Bring next digit (5) of the dividend behind the 535 and repeat the process: 5355 / 810

Step 5:
When dividing 5355 by 810, we get 6 with a remainder of 495.
The number 6 becomes the next digit in our result. 
Result so far: 106.0
Subtract 4860 from 5355 to get 495.
Take the next digit (4) from the dividend and append it to 495, then repeat: 4954 / 810

Going ahead to step 6:
810 goes into 4954 6 times with a remainder of 94.
Use 6 as the next digit of our solution. 
Result so far: 1066.0
Subtract 4860 from 4954 to get 94.
Append the next digit (9) from the dividend to 94 and continue with: 949 / 810

Advancing to step 7:
The number 810 fits into 949 1 times, leaving a remainder of 139.
Use 1 as the next digit of our solution. 
Result so far: 10661.0
The remainder is 139 after subtracting 810 from 949.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Advancing to step 8:
810 goes into 1390 1 times with a remainder of 580.
The next digit of our result is 1. 
Result so far: 10661.1
Deduct 810 from 1390 and we're left with 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

Let's proceed to step 9:
The number 810 fits into 5800 7 times, leaving a remainder of 130.
Use 7 as the next digit of our solution. 
Result so far: 10661.17
If we subtract 5670 from 5800, we get 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Step 10:
810 can be fit into 1300 1 times, resulting in a remainder of 490.
Put 1 as the next digit of the answer. 
Result so far: 10661.171
If we take 810 away from 1300, we end up with 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Step 11:
810 goes into 4900 6 times with a remainder of 40.
The next digit of our result is 6. 
Result so far: 10661.1716
If we subtract 4860 from 4900, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 12:
If we divide 400 by 810, we get 0 and a remainder of 400.
Write down 0 as next digit of the result. 
Result so far: 10661.1716
Subtract 0 from 400 to 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.

Let's proceed to step 13:
810 goes into 4000 4 times with a remainder of 760.
Record the quotient 4 as the next digit in the result. 
Result so far: 10661.171604
Subtracting 3240 from 4000 leaves us with 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7600, and continue the process.

Going ahead to step 14:
If we divide 7600 by 810, we get 9 and a remainder of 310.
Record the quotient 9 as the next digit in the result. 
Result so far: 10661.1716049
Deduct 7290 from 7600 and we're left with 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

On to step 15:
810 can be fit into 3100 3 times, resulting in a remainder of 670.
Use 3 as the next digit of our solution. 
Result so far: 10661.17160493
Deduct 2430 from 3100 and we're left with 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

Our division results in 10661.17160493 with a remaining 6.7e-07.