We're dividing 10182971 by 815 
The aim is to understand the frequency of 815 in 10182971.

Step 1:
If we divide 1 by 815, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 815

Step 2:
10 divided by 815 is 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 10 and we're left with 10.
Grab the next digit (1) from the dividend, add it to 10, then carry on: 101 / 815

Let's proceed to step 3:
101 divided by 815 is 0 with a remainder of 101.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 101 leaves us with 101.
Bring next digit (8) of the dividend behind the 101 and repeat the process: 1018 / 815

Let's proceed to step 4:
When dividing 1018 by 815, we get 1 with a remainder of 203.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 815 from 1018, we get 203.
Fetch the next digit (2) from the dividend, attach it to 203 and continue: 2032 / 815

Let's proceed to step 5:
The number 815 fits into 2032 2 times, leaving a remainder of 402.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we take 1630 away from 2032, we end up with 402.
Include the next digit (9) from the dividend after 402, then repeat: 4029 / 815

Moving on to step 6:
The number 815 fits into 4029 4 times, leaving a remainder of 769.
The number 4 becomes the next digit in our result. 
Result so far: 124.0
Subtract 3260 from 4029 to get 769.
Append the next digit (7) from the dividend to 769 and continue with: 7697 / 815

Step 7:
7697 divided by 815 is 9 with a remainder of 362.
Use 9 as the next digit of our solution. 
Result so far: 1249.0
If we subtract 7335 from 7697, we get 362.
Grab the next digit (1) from the dividend, add it to 362, then carry on: 3621 / 815

Moving on to step 8:
815 can be fit into 3621 4 times, resulting in a remainder of 361.
Write down 4 as next digit of the result. 
Result so far: 12494.0
Subtract 3260 from 3621 to get 361.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3610, and continue the process.

Advancing to step 9:
815 goes into 3610 4 times with a remainder of 350.
Put 4 as the next digit of the answer. 
Result so far: 12494.4
Subtracting 3260 from 3610 leaves us with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Going ahead to step 10:
815 goes into 3500 4 times with a remainder of 240.
Record the quotient 4 as the next digit in the result. 
Result so far: 12494.44
Subtract 3260 from 3500 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

The final outcome is 12494.44, with a leftover of 0.24.