We divide 515186 by 15
The aim is to understand the frequency of 15 in 515186.

Step 1:
When dividing 5 by 15, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 15

Step 2:
If we divide 51 by 15, we get 3 and a remainder of 6.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 45 from 51 and we're left with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 15

Moving on to step 3:
65 divided by 15 is 4 with a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 34.0
If we take 60 away from 65, we end up with 5.
Include the next digit (1) from the dividend after 5, then repeat: 51 / 15

Let's proceed to step 4:
The number 15 fits into 51 3 times, leaving a remainder of 6.
The next digit of our result is 3. 
Result so far: 343.0
If we take 45 away from 51, we end up with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 15

On to step 5:
When dividing 68 by 15, we get 4 with a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 3434.0
If we subtract 60 from 68, we get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 15

On to step 6:
15 can be fit into 86 5 times, resulting in a remainder of 11.
The next digit of our result is 5. 
Result so far: 34345.0
If we take 75 away from 86, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
When dividing 110 by 15, we get 7 with a remainder of 5.
Write down 7 as next digit of the result. 
Result so far: 34345.7
Subtracting 105 from 110 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 8:
15 can be fit into 50 3 times, resulting in a remainder of 5.
Use 3 as the next digit of our solution. 
Result so far: 34345.73
The remainder is 5 after subtracting 45 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
If we divide 50 by 15, we get 3 and a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 34345.733
If we subtract 45 from 50, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

In conclusion, the division gives 34345.733 with a balance of 0.0005.