We look at the division of 28641230 by 813 
The aim is to understand the frequency of 813 in 28641230.

Advancing to step 1:
The number 813 fits into 2 0 times, leaving a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 813

On to step 2:
28 divided by 813 is 0 with a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 28 leaves us with 28.
Bring next digit (6) of the dividend behind the 28 and repeat the process: 286 / 813

Moving on to step 3:
If we divide 286 by 813, we get 0 and a remainder of 286.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 286 to get 286.
Take the next digit (4) from the dividend and append it to 286, then repeat: 2864 / 813

Moving on to step 4:
If we divide 2864 by 813, we get 3 and a remainder of 425.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
The remainder is 425 after subtracting 2439 from 2864.
Include the next digit (1) from the dividend after 425, then repeat: 4251 / 813

Moving on to step 5:
When dividing 4251 by 813, we get 5 with a remainder of 186.
The number 5 becomes the next digit in our result. 
Result so far: 35.0
Subtracting 4065 from 4251 leaves us with 186.
Append the next digit (2) from the dividend to 186 and continue with: 1862 / 813

Step 6:
When dividing 1862 by 813, we get 2 with a remainder of 236.
Write down 2 as next digit of the result. 
Result so far: 352.0
Subtracting 1626 from 1862 leaves us with 236.
Include the next digit (3) from the dividend after 236, then repeat: 2363 / 813

Let's proceed to step 7:
2363 divided by 813 is 2 with a remainder of 737.
Write down 2 as next digit of the result. 
Result so far: 3522.0
Subtracting 1626 from 2363 leaves us with 737.
Append the next digit (0) from the dividend to 737 and continue with: 7370 / 813

Let's proceed to step 8:
If we divide 7370 by 813, we get 9 and a remainder of 53.
The number 9 becomes the next digit in our result. 
Result so far: 35229.0
If we subtract 7317 from 7370, we get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Going ahead to step 9:
The number 813 fits into 530 0 times, leaving a remainder of 530.
Put 0 as the next digit of the answer. 
Result so far: 35229.0
The remainder is 530 after subtracting 0 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Advancing to step 10:
813 goes into 5300 6 times with a remainder of 422.
Record the quotient 6 as the next digit in the result. 
Result so far: 35229.06
Subtracting 4878 from 5300 leaves us with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Step 11:
4220 divided by 813 is 5 with a remainder of 155.
Write down 5 as next digit of the result. 
Result so far: 35229.065
If we subtract 4065 from 4220, we get 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Going ahead to step 12:
813 goes into 1550 1 times with a remainder of 737.
The number 1 becomes the next digit in our result. 
Result so far: 35229.0651
Deduct 813 from 1550 and we're left with 737.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7370, and continue the process.

Let's proceed to step 13:
7370 divided by 813 is 9 with a remainder of 53.
The next digit of our result is 9. 
Result so far: 35229.06519
The remainder is 53 after subtracting 7317 from 7370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 14:
The number 813 fits into 530 0 times, leaving a remainder of 530.
Record the quotient 0 as the next digit in the result. 
Result so far: 35229.06519
Subtract 0 from 530 to get 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5300, and continue the process.

Let's proceed to step 15:
5300 divided by 813 is 6 with a remainder of 422.
Use 6 as the next digit of our solution. 
Result so far: 35229.0651906
Subtracting 4878 from 5300 leaves us with 422.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4220, and continue the process.

Moving on to step 16:
813 goes into 4220 5 times with a remainder of 155.
The number 5 becomes the next digit in our result. 
Result so far: 35229.06519065
Subtracting 4065 from 4220 leaves us with 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

The final result is 35229.06519065 with a remainder of 1.55e-07.