We divide 520315 by 15
The aim is to understand the frequency of 15 in 520315.

On to step 1:
When dividing 5 by 15, we get 0 with a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 15

Let's proceed to step 2:
The number 15 fits into 52 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we take 45 away from 52, we end up with 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 15

Let's proceed to step 3:
15 can be fit into 70 4 times, resulting in a remainder of 10.
Write down 4 as next digit of the result. 
Result so far: 34.0
If we take 60 away from 70, we end up with 10.
Grab the next digit (3) from the dividend, add it to 10, then carry on: 103 / 15

Step 4:
15 can be fit into 103 6 times, resulting in a remainder of 13.
Record the quotient 6 as the next digit in the result. 
Result so far: 346.0
Subtract 90 from 103 to get 13.
Include the next digit (1) from the dividend after 13, then repeat: 131 / 15

Let's proceed to step 5:
If we divide 131 by 15, we get 8 and a remainder of 11.
Use 8 as the next digit of our solution. 
Result so far: 3468.0
Subtracting 120 from 131 leaves us with 11.
Fetch the next digit (5) from the dividend, attach it to 11 and continue: 115 / 15

Advancing to step 6:
When dividing 115 by 15, we get 7 with a remainder of 10.
Put 7 as the next digit of the answer. 
Result so far: 34687.0
Subtract 105 from 115 to get 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 7:
100 divided by 15 is 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 34687.6
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
15 can be fit into 100 6 times, resulting in a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 34687.66
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Our division results in 34687.66 with a remaining 0.01.