We're dividing 812175 by 15 
The aim is to understand the frequency of 15 in 812175.

Going ahead to step 1:
The number 15 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 15

On to step 2:
81 divided by 15 is 5 with a remainder of 6.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we take 75 away from 81, we end up with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 15

Moving on to step 3:
The number 15 fits into 62 4 times, leaving a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 54.0
Subtract 60 from 62 to get 2.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 15

On to step 4:
21 divided by 15 is 1 with a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 541.0
Subtract 15 from 21 to get 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 15

Going ahead to step 5:
If we divide 67 by 15, we get 4 and a remainder of 7.
Record the quotient 4 as the next digit in the result. 
Result so far: 5414.0
Subtracting 60 from 67 leaves us with 7.
Fetch the next digit (5) from the dividend, attach it to 7 and continue: 75 / 15

On to step 6:
75 divided by 15 is 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 54145.0
The remainder is 0 after subtracting 75 from 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 7:
0 divided by 15 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 54145.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 8:
If we divide 0 by 15, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 54145.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 54145.0 with a remainder of 0.0.