We're dividing 571504 by 15 
The aim is to understand the frequency of 15 in 571504.

On to step 1:
15 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 15

Step 2:
If we divide 57 by 15, we get 3 and a remainder of 12.
Put 3 as the next digit of the answer. 
Result so far: 3.0
Subtract 45 from 57 to get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 15

Moving on to step 3:
121 divided by 15 is 8 with a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 38.0
If we take 120 away from 121, we end up with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 15

On to step 4:
15 divided by 15 is 1 with a remainder of 0.
The next digit of our result is 1. 
Result so far: 381.0
If we subtract 15 from 15, we get 0.
Take the next digit (0) from the dividend and append it to 0, then repeat: 0 / 15

Going ahead to step 5:
When dividing 0 by 15, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 3810.0
Deduct 0 from 0 and we're left with 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 15

Let's proceed to step 6:
4 divided by 15 is 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 38100.0
The remainder is 4 after subtracting 0 from 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 7:
15 can be fit into 40 2 times, resulting in a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 38100.2
Subtracting 30 from 40 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 8:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 38100.26
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
100 divided by 15 is 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 38100.266
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 38100.266 with a remainder of 0.001.